Ongoing: you may complete quest CARDS from your hand. As you do, remove them from the game as an additional cost.

持续：你可以从你的手牌中完成任务。如果你这么做，把这样完成的任务移出游戏。

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Ongoing: you may complete quest CARDS from your graveyard. As you do, remove them from the game as an additional cost.

持续：你可以从你的坟场里完成任务。如果你这样做，把这样完成的任务移出游戏。

youdao

Players quest around maps and acquire cards, level up, sacrifice cards to make other cards stronger, and battle other players.

FORBES: Zynga's War of the Fallen Is A Refined Card Battler