Decay

Decay comes into play with 6 elemental charges, when Decay has no charges left; transform Decay into a Void Emblem.
|-3| Create a token copy of target creature with CMC 3 or less into the battlefield, exile the targeted creature.
|-2| Target player sacrifices your choice of creature or enchantment they control. you lose life equal to its mana cost.
|-1| Create a decomposed token.