Teneb Charm

Necro {w} or {g}(When you cast this spell, you may
remove a creature card with {w} or {g} in its casting
cost from your graveyard. If you do, this spell costs
either {w} or {g} less to cast.)
Destroy target creature. It can't be regenerated.
You may either put a +1/+1 counter on target creature, or add {2} at the beginning of your next
main phase. This mana can only be used to cast
an enchantment spell.