Marcus, Skull Collector

+2: Destroy one creature you control, create a token artifact "skull, sacrifice and put a -1/-1 counter on target creature."
-2: During your attack phase, whenever a creature you control is blocked put a -1/-1 counter on blocking creatures.
-8: Destroy all creatures you don't control with -1/-1 creatures on them. Choose up to three target enchantments and artifacts and destroy them.