Final Payment

Convoke (Each creature you tap while playing this spell reduces its cost by {1} or by one mana
of that creature's color)
1-3= Destroy target creature or enchantment
it's owner gains 3 life & you lose 3 life.
4-8= Same as above except you don't lose life.
9-14= Same as above except they will lose life.
15-20= Same as above except you gain 3 life.