Lockjaw Snapper

Artifact Creature - Scarecrow 2/2, 4 (4)
Wither (This deals damage to creatures in the form of -1/-1 counters.)
When Lockjaw Snapper is put into a graveyard from the battlefield, put a -1/-1 counter on each creature with a -1/-1 counter on it.¹
Illus. Daren Bader

Gatherer Card Rulings [Nov 2009]

• 5/1/2008: Each of those creatures will get just one new -1/-1 counter, regardless of how many it already has.

Format Legality	Legal in Vintage, Legacy, Extended Banned in Standard
Printings (1/10)	Shadowmoor (Uncommon)