Fountain of Blood

{t}: Put one Flesh counter on Fountain of Blood
{t}: Put one Blood counter on Fountain of Blood
If there are 6 or more Flesh counters on Fountain
of Blood, remove all Flesh counters from it and
create a 6/6 Demon creature token with flying
If there are 10 or more Blood counters on
Fountain of Blood, remove all Blood counters
from it and destroy up to 5 target creatures
If there are no counters of Fountain of Blood, sacrifice it.