Vraska, Swarm Empress

At the end of your turn, put the top three cards
of your library into your graveyard. Then you
may put one of those cards on top of your library.
Whenever a spell or ability you control targets a
card in your graveyard, create a 1/1 green Snake creature token with deathtouch.
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"It is an irony in which my contempt for your
existence feeds the very cycle of life. How poetic."
—Vraska