Abrupt Decay
Black ManaGreen Mana
Abrupt Decay can't be countered by spells or abilities.
Destroy target nonland permanent with converted mana cost 3 or less.

The converted mana cost of a creature token is 0, unless that token is a copy of another creature, in which case it copies that creature's mana cost.

If the permanent has X Mana in its mana cost, X is 0.