Font of Agonies 
Enchantment
Whenever you pay life, put that many blood counters on this enchantment.
, Remove four blood counters from this enchantment: Destroy target creature.
Legality
standardNOT LEGALpioneerLEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL