The Dying Skull

({p/c} can be paid with either {w} or 2 life.)
Creatures you control have fear.
(They can't be blocked except by artifact creatures and/or black creatures.)
{p/w}, Sacrifice a creature: You draw two
cards and you lose 2 life.
{t}, Sacrifice a Ring: Add Three mana in any combination of colors. Spend this mana only
to play creature spells.