monstrous coffin flower

{t}: add one mana of any color
when monstrous coffin flower enters the battlefield exile a creature card from your
graveyard until monstrous coffin flower leaves
the battlefield,put a x/x green and black zombie
creature token with indestructible defender and hexproof on the battlefield, where X is mana cost
of that card, at the start of your upkeep put a
-1/-1 counter on that token and a +1/+1
counter on monstrous coffin flower.