Sturdy Hatchling

Oracle Text:

Sturdy Hatchling comes into play with four -1/-1 counters on it.
o(g/u): Sturdy Hatchling gains shroud until end of turn.
Whenever you play a green spell, remove a -1/-1 counter from Sturdy Hatchling.
Whenever you play a blue spell, remove a -1/-1 counter from Sturdy Hatchling.