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It looks like there are actually two terms for this type of game, depending on the distribution model (repeated subscription-like purchases or a one-time purchase).
A "Living Card Game" (LCG) is game where you buy the full set of cards at once. Later expansions may come out, which can be purchased separately.
A "Deck-Building Game" is a game where you ...
2
Those are mana costs to cast cards in your deck. The numbers represent the total amount of mana to cast. For instance, if you have a card that costs 2 green and 1 blue, it will fall under the 3-cost pile.
My guess for the 23 0-cost cards is that they are primarily lands, as 1/3 is roughly the recommended amount of lands for a deck. In general, you want as ...
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