Noxious Hatchling [Eventide]

Set: Eventide Type: Creature — Elemental Rarity: Uncommon Cost: {3}{B/G} Noxious Hatchling enters the battlefield with four -1/-1 counters on it.Wither (This deals damage to creatures in the form of -1/-1 counters.)Whenever you cast a black spell, remove a -1/-1 counter from Noxious Hatchling.Whenever you cast a green spell, remove a -1/-1 counter from Noxious Hatchling.