Blood Weeping Cliff

When Blood Weeping Cliff enters play, each
target opponent chooses a creature they control.
It gains +3/+3 and "This creature must attack
this round" at the beginning of their next main
phase.
{t}: Add {b}.
When a creature dies during the combat phase,
put a blood counter onto Blood Weeping Cliff.
If there are three such counters, remove them
and transform it into Font of Endless Gore.