Reincarnate as a Slime

As an additional cost to cast this spell, exile
a creature card from your graveyard.
Create a token that's a copy of the exiled
card, except it's a 0/0 green Ooze in addition
to its other types. It enters the battlefield
with a number of +1/+1 counters on it
equal to the exiled card's mana value.