Ranni the Witch

Whenever you cast a noncreature spell, surveil 1.
At the beginning of your upkeep, exile a card
from your graveyard. If you can't, sacrifice Ranni
then mill 3 cards.
At the beginning of combat on your turn, you
may tap Ranni. If you do, create a token copy of
target creature in your graveyard. It gains haste.
Exile it at the beginning of the next end step.