Deathbloom, Necrogerminator

If there are no creatures on the battlefield, you
may pay {b}{g} instead paying this spell's casting
cost. If you do, it enters the battlefield with base
stats 1/1.
{b}{b}{g}{g}, exile up to one creature card from each player's graveyard: Put X +1/+1 counters on
Skullbloom, where X is the number of cards
exiled this way.