Roope, the Fungal Father

Whenever Roope, the Fungal Father enters the battlefield, create X 1/1 green saproling creature
tokens where X is the number creature cards in
target graveyard.
At the beginning of your end step, you may exile
Roope. If you do, return it to the battlefield at the beginning of your next upkeep. It gains haste.
{t}: Discard a card.