Cathedral of Flesh

{t}: Add {b}{r}
Whenever a creature dies, put a Flesh counter on Cathedral of Flesh.
{3}, Remove three Flesh counters, Destroy target creature: Target opponent loses 3 life and discards a card. If target creature was Yorak, Methuselah of Tzimisce, Cathedral phases out.

As long as Cathedral of Flesh has five or more Flesh counters, it becomes a 6/6 black and red Demon named Kupala, Earthbound, with trample and menace. It’s still a land.