Gambling with the Devil

Discard your hand, then draw seven cards. For
the rest of the game, at the beginning of your
upkeep and whenever you cast a spell, flip a coin.
If you lose the flip, discard a card. Then if you
have no cards in hand, you lose the game.
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"You have everything to gain by playing. But
remember: only the first time is free."
—Saya, Demon Queen of Desire