Shrewd Hatchling

Oracle Text:

Shrewd Hatchling comes into play with four -1/-1 counters on it.
o(u/r): Target creature can't block Shrewd Hatchling this turn.
Whenever you play a blue spell, remove a -1/-1 counter from Shrewd Hatchling.
Whenever you play a red spell, remove a -1/-1 counter from Shrewd Hatchling.