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The Binding of Isaac wiki's got a pretty comprehensive (if slightly generalized, and minorly inaccurate) list. Remember that all cards are a single use item, so once they are used they vanish.

• O The Fool: Teleports the player to the starting room for that floor.
• I The Magician: Gives you the use of Spoon Bender (homing shots) until you leave the current room.
• II The High Priestess: Summon's Mom's foot stomp on a random enemy. Can also hit the player, and will do so if there are no enemies in the room.
• III The Empress: Gives you the use of Whore of Babylon until you leave the room. Whore of Babylon is Eve's curse, but unlike her version, this just hurts you half a heart then increases your damage.
• IV The Emperor: Teleports the player to the Boss Room.
• V The Hierophant: Spawns two soul hearts.
• VI The Lovers: Spawns two hearts.
• VII The Chariot: Acts as a single-shot use of My Little Unicorn.
• VIII Justice: Spawns bombs, hearts, coins, and keys around the player.
• IX The Hermit: Teleports the player to the Mini-boss Room, or the shop if a mini-boss room is not available.
• X Wheel of Fortune: Spawns a Slot Machine.
• XI Strength: Makes the player bigger, increasing maximum health and damage until the player leaves the room.
• XII The Hanged Man: Gives you the use of Transcendence (flight over gaps, rocks and spikes) until you leave the current room.
• XIII Death: Gives you a single use of The Necronomicon (massive damage to all enemies in the room).
• XIV Temperance: Spawns a Blood Donation Machine.
• XV The Devil: Gives you a single use of Book of Belial (increased tear damage) until you leave the current room.
• XVI The Tower: Gives you a single use of Anarchist's Cookbook (spawns multiple bombs around the room at random).
• XVII The Stars: Teleports the player to the Item Room, or acts as Telepills if there is no item room (i.e. in The Womb and Sheol).
• XVIII The Moon: Teleports the player to the Secret Room.
• XIX The Sun: Completely heals the player, does damage to all enemies on screen and acts as a Treasure Map and Compass for the current level only.
• XX Judgement: Spawns a beggar. If you have no money, spawns 1 heart, coin, bomb and key instead.
• XXI The World: Acts as a Treasure Map and a Compass for the current level only.

Tarot Cards II, III, XVII, and XIX were added in a patch on November 1 2011.

The Binding of Isaac wiki's got a pretty comprehensive (if slightly generalized, and minorly inaccurate) list. Remember that all cards are a single use item, so once they are used they vanish.

• O The Fool: Teleports the player to the starting room for that floor.
• I The Magician: Gives you the use of Spoon Bender (homing shots) until you leave the current room.
• II The High Priestess: Summon's Mom's foot stomp on a random enemy. Can also hit the player, and will do so if there are no enemies in the room.
• III The Empress: Gives you the use of Whore of Babylon until you leave the room. Whore of Babylon is Eve's curse, but unlike her version, this just hurts you half a heart then increases your damage.
• IV The Emperor: Teleports the player to the Boss Room.
• V The Hierophant: Spawns two soul hearts.
• VI The Lovers: Spawns two hearts.
• VII The Chariot: Acts as a single-shot use of My Little Unicorn.
• VIII Justice: Spawns bombs, hearts, coins, and keys around the player.
• IX The Hermit: Teleports the player to the Mini-boss Room, or the shop if a mini-boss room is not available.
• X Wheel of Fortune: Spawns a Slot Machine.
• XI Strength: Makes the player bigger, increasing maximum health and damage until the player leaves the room.
• XII The Hanged Man: Gives you the use of Transcendence (flight over gaps, rocks and spikes) until you leave the current room.
• XIII Death: Gives you a single use of The Necronomicon (massive damage to all enemies in the room).
• XIV The Tower: Gives you a single use of Anarchist's Cookbook (spawns multiple bombs around the room at random).
• XV The Devil: Gives you a single use of Book of Belial (increased tear damage) until you leave the current room.
• XVI Temperance: Spawns a Blood Donation Machine.
• XVII The Stars: Teleports the player to the Item Room, or acts as Telepills if there is no item room (i.e. in The Womb and Sheol).
• XVIII The Moon: Teleports the player to the Secret Room.
• XIX The Sun: Completely heals the player, does damage to all enemies on screen and acts as a Treasure Map and Compass for the current level only.
• XX Judgement: Spawns a beggar. If you have no money, spawns 1 heart, coin, bomb and key instead.
• XXI The World: Acts as a Treasure Map and a Compass for the current level only.

Tarot Cards II, III, XVII, and XIX were added in a patch on November 1 2011.

The Binding of Isaac wiki's got a pretty comprehensive (if slightly generalized, and minorly inaccurate) list. Remember that all cards are a single use item, so once they are used they vanish.

• O The Fool: Teleports the player to the starting room for that floor.
• I The Magician: Gives you the use of Spoon Bender (homing shots) until you leave the current room.
• IV The Emperor: Teleports the player to the Boss Room.
• V The Hierophant: Spawns two soul hearts.
• VI The Lovers: Spawns two hearts.
• VII The Chariot: Gives you a single-shot use of My Little Unicorn.
• VIII Justice: Spawns bombs, hearts, coins, and keys around the player.
• IX The Hermit: Teleports the player to the Mini-boss Room, or the shop if a mini-boss room is not available.
• X Wheel of Fortune: Spawns a Slot Machine.
• XI Strength: Makes the player bigger, increasing maximum health and damage until the player leaves the room.
• XII The Hanged Man: Gives you the use of Transcendence (flight over gaps, rocks and spikes) until you leave the current room.
• XIII Death: Gives you a single use of The Necronomicon (massive damage to all enemies in the room).
• XIV Temperance: Spawns a Blood Donation Machine.
• XV The Devil: Gives you a single use of Book of Belial (increased tear damage) until you leave the current room.
• XVI The Tower: Gives you a single use of Anarchist's Cookbook (spawns multiple bombs around the room at random).
• XVIII The Moon: Teleports the player to the Secret Room.
• XX Judgement: Spawns a beggar. If you have no money, spawns 1 heart, coin, bomb and key instead.
• XXI The World: Acts as a Treasure Map for the current level only.

Tarot Cards II, III, XVII, and XIX are not present in the game, for one reason or another.

Off the top of my head, I've had The Hermit transport me to a shop (instead of the mini-boss room), and The World actually has a greater effect than that of the treasure map (not only do you see the rooms, you also see what's in them).

The Binding of Isaac wiki's got a pretty comprehensive (if slightly generalized, and minorly inaccurate) list. Remember that all cards are a single use item, so once they are used they vanish.

• O The Fool: Teleports the player to the starting room for that floor.
• I The Magician: Gives you the use of Spoon Bender (homing shots) until you leave the current room.
• II The High Priestess: Summon's Mom's foot stomp on a random enemy. Can also hit the player, and will do so if there are no enemies in the room.
• III The Empress: Gives you the use of Whore of Babylon until you leave the room. Whore of Babylon is Eve's curse, but unlike her version, this just hurts you half a heart then increases your damage.
• IV The Emperor: Teleports the player to the Boss Room.
• V The Hierophant: Spawns two soul hearts.
• VI The Lovers: Spawns two hearts.
• VII The Chariot: Acts as a single-shot use of My Little Unicorn.
• VIII Justice: Spawns bombs, hearts, coins, and keys around the player.
• IX The Hermit: Teleports the player to the Mini-boss Room, or the shop if a mini-boss room is not available.
• X Wheel of Fortune: Spawns a Slot Machine.
• XI Strength: Makes the player bigger, increasing maximum health and damage until the player leaves the room.
• XII The Hanged Man: Gives you the use of Transcendence (flight over gaps, rocks and spikes) until you leave the current room.
• XIII Death: Gives you a single use of The Necronomicon (massive damage to all enemies in the room).
• XIV Temperance: Spawns a Blood Donation Machine.
• XV The Devil: Gives you a single use of Book of Belial (increased tear damage) until you leave the current room.
• XVI The Tower: Gives you a single use of Anarchist's Cookbook (spawns multiple bombs around the room at random).
• XVII The Stars: Teleports the player to the Item Room, or acts as Telepills if there is no item room (i.e. in The Womb and Sheol).
• XVIII The Moon: Teleports the player to the Secret Room.
• XIX The Sun: Completely heals the player, does damage to all enemies on screen and acts as a Treasure Map and Compass for the current level only.
• XX Judgement: Spawns a beggar. If you have no money, spawns 1 heart, coin, bomb and key instead.
• XXI The World: Acts as a Treasure Map and a Compass for the current level only.

Tarot Cards II, III, XVII, and XIX were added in a patch on November 1 2011.

The Binding of Isaac wiki's got a pretty comprehensive (if slightly generalized, and minorly inaccurate) list.

O The Fool  Teleports the player to the starting room for that floor.
I The Magician  Gives you the use of Spoon Bender until you leave the current room.
IV The Emperor  Teleports the player to the Boss Room.
V The Hierophant    Spawns two soul hearts.
VI The Lovers   Spawns two hearts.
VII The Chariot Gives you a single-shot use of My Little Unicorn.
VIII Justice    Spawns bombs, hearts, coins, and keys around the player .
IX The Hermit   Teleports the player to the Mini-boss Room, or the shop if a mini-boss room is not available.
X Wheel of Fortune  Spawns a Slot Machine.
XI Strength Makes the player bigger, increasing maximum health and damage until the player leaves the room.
XII The Hanged Man  Gives you the use of Transcendence until you leave the current room.
XIII Death  Gives you the use of The Necronomicon.
XIV Temperance  Spawns a Blood Donation Machine.
XV The Devil    Gives you the use of Book of Belial until you leave the current room.
XVI The Tower   Gives you the use of Anarchist's Cookbook.
XVIII The Moon  Teleports the player to the Secret Room.
XX Judgement    Spawns a beggar. If you have no money, spawns 1 heart, coin, bomb and key instead.
XXI The World   Acts as a Treasure Map for the current level only.

The Binding of Isaac wiki's got a pretty comprehensive (if slightly generalized, and minorly inaccurate) list. Remember that all cards are a single use item, so once they are used they vanish.

• O The Fool: Teleports the player to the starting room for that floor.
• I The Magician: Gives you the use of Spoon Bender (homing shots) until you leave the current room.
• IV The Emperor: Teleports the player to the Boss Room.
• V The Hierophant: Spawns two soul hearts.
• VI The Lovers: Spawns two hearts.
• VII The Chariot: Gives you a single-shot use of My Little Unicorn.
• VIII Justice: Spawns bombs, hearts, coins, and keys around the player.
• IX The Hermit: Teleports the player to the Mini-boss Room, or the shop if a mini-boss room is not available.
• X Wheel of Fortune: Spawns a Slot Machine.
• XI Strength: Makes the player bigger, increasing maximum health and damage until the player leaves the room.
• XII The Hanged Man: Gives you the use of Transcendence (flight over gaps, rocks and spikes) until you leave the current room.
• XIII Death: Gives you a single use of The Necronomicon (massive damage to all enemies in the room).
• XIV Temperance: Spawns a Blood Donation Machine.
• XV The Devil: Gives you a single use of Book of Belial (increased tear damage) until you leave the current room.
• XVI The Tower: Gives you a single use of Anarchist's Cookbook (spawns multiple bombs around the room at random).
• XVIII The Moon: Teleports the player to the Secret Room.
• XX Judgement: Spawns a beggar. If you have no money, spawns 1 heart, coin, bomb and key instead.
• XXI The World: Acts as a Treasure Map for the current level only.