Necroskitter

Creature - Elemental 1/4, 1BB (3)
Wither (This deals damage to creatures in the form of -1/-1 counters.)

Whenever a creature an opponent controls with a -1/-1 counter on it is put into a graveyard, you may return that card to the battlefield under your control.¹
Illus. Jaime Jones

Gatherer Card Rulings [Nov 2009]

• 8/1/2008: It doesn't matter whose graveyard the creature is put into. It matters only that an opponent controlled it when it left the battlefield.
• 8/1/2008: It doesn't matter how many -1/-1 counters were on the creature when it was put into a graveyard from the battlefield, as long as it had at least one.
• 8/1/2008: The card returns to the battlefield without any -1/-1 counters on it (unless some other effect causes it to enter the battlefield with some).

Format Legality	Legal in Vintage, Legacy, Extended, MTGO Classic Banned in Standard
Printings (1/9)	Eventide (Rare)