Shambling Phytohydra

Trample, delve (Each card you exile from your graveyard while casting this spell pays for {1})
Shambling Phytohydra enters the battlefield with X +1/+1 counters.
{3}{b}{g}, Exile a card from your graveyard: Put a number of +1/+1 counters on Shambling Phytohydra equal to that creature's power. It gains indestructible until end of turn.