Festercreep 
Creature — Elemental
This creature enters with a +1/+1 counter on it.
, Remove a +1/+1 counter from this creature: All other creatures get -1/-1 until end of turn.
Legality
standardNOT LEGALpioneerNOT LEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL