Festercreep

Creature - Elemental 0/0, 1B (2)
Festercreep enters the battlefield with a +1/+1 counter on it.

{1}{B}, Remove a +1/+1 counter from Festercreep: All other creatures get -1/-1 until end of turn.¹
A single festercreep isn't alone. It's already an infestation.
Illus. Jeff Easley

Format Legality	Legal in Vintage, Legacy, Extended, MTGO Classic Banned in Standard
Printings (1/10)	Morningtide (Common)