Shrewd Hatchling is a uncommon Creature — Elemental card from Modern Masters 2015 (MM2), collector number 198. Current market price: $0.07 (foil $0.13), TCGplayer market prices via Scryfall.
This creature enters with four -1/-1 counters on it. {U/R}: Target creature can't block this creature this turn. Whenever you cast a blue spell, remove a -1/-1 counter from this creature. Whenever you cast a red spell, remove a -1/-1 counter from this creature.