Cathedral of Flesh

{t}: Add {b}{r}
Whenever a creature dies, put a Flesh counter on Cathedral of Flesh.

Remove three Flesh counters, Destroy target creature: target opponent loses 3 life and discards a card. If target creature was Yorak, Methuselah of Clan Tzimisce, Cathedral of Flesh phases out.
As long as Cathedral of Flesh has five or more Flesh counters, it becomes a 6/6 black and red Horror with trample and menace. It's still a land.