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[0]: Exile Kaya, Ghost Assassin or up to one target creature. Return that card to the battlefield under its owner's control at the beginning of your next upkeep. You lose 2 life.
[−1]: Each opponent loses 2 life and you gain 2 life.
[−2]: Each opponent discards a card and you draw a card.
As the last ability resolves, each opponent will choose a card to discard and set it aside. Then all those cards are revealed and discarded simultaneously.
If you didn’t choose a target creature for the first ability, and Kaya isn’t on the battlefield as the ability resolves, you’ll just lose 2 life. No card will be exiled or returned to the battlefield.
You choose whether or not to target a creature as you activate the first ability. If you chose a target creature, you choose whether to exile Kaya or that creature as the ability resolves. If you chose a creature and that creature is no longer a legal target as the ability tries to resolve, the ability doesn’t resolve and none of its effects happen. You won’t exile Kaya or lose 2 life.
