Sipatli, Consuming Earth

As long as Sipatli, Consuming Earth has less
than 6 blood counters on it, it's a land.
Whenever a creature enters the battlefield
under an opponent's control, they must sacrifice
it unless they pay {1}. Whenever a creature is sacrificed, put a blood counter on Sipatli.
{t}: Add {g}, {u}, or {r} for each blood counter on Sipatli.