Evanescet, World Purger

(When you draw this event creature, cast it as its
event effect and exile this card, then draw a card. You
may cast this creature later from exile.)
Event The Purge —
All creatures get -1/-1 until end of turn.
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Impartial
Whenever a creature enters the battlefield under
an opponent's control, it get -1/-1 until end of
turn.