What does Shrewd Hatchling do?
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Shrewd Hatchling enters with four -1/-1 counters on it.\n{U/R}: Target creature can't block Shrewd Hatchling this turn.\nWhenever you cast a blue spell, remove a -1/-1 counter from Shrewd Hatchling.\nWhenever you cast a red spell, remove a -1/-1 counter from Shrewd Hatchling.
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