In previous iterations of the Magic 20XX: Duels of the Planeswalkers games, victory in a multiplayer game (and a single player / campaign game) would reward you with an unlocked card for the deck you were playing.
This made sense, as in previous iterations, players chose from a selection of pre-built decks (much like a purchased 'starter' deck in the tabletop game,) and could only increase available cards for that deck by winning duels.
Magic 2014's Sealed Play mode was an exception - you'd unlock booster packs, for use in your Sealed Play library which in turn was used to construct Sealed Play decks, which could only be played against other Sealed Play decks and not standard decks.
Magic 2015 operates under a sort of hybrid format - you still start with a predefined deck, but it's customised in the style of Magic 2014's Sealed Play, i.e. completion of single player duels rewards you with a booster pack, which enters your card pool, out of which you customise your starting deck or create new ones.
However, based on my experience thus far with multiplayer games in Magic 2015, there doesn't appear to be a tangible reward - when you win a match, you are returned to the main menu and recieve no notification of a booster or unlocked card.
The only discussion I could find on the subject (on the Steam forums, via Google) was inconclusive; none of the reviews I've read have mentioned this.
Are there any conditions (such as a certain stage of completion in the campaign) in which winning a multiplayer game will reward you with cards for your deck(s), or are single player campaign/explore duels now the only way in which cards can be unlocked?