Decaying Polypus

Lurking (You may cast this card from your graveyard by sacrificing a land in addition to paying its other costs.)
Whenever a land is put into your graveyard, tap target permanent. It does not untap for as long as you control Decaying Polypus.
At the beginning of your end step, put a -1/-1 counter on Decaying Polypus unless you sacrifice a land.