Cheapest priced copy (Duel Decks: Izzet vs. Golgari): $0.35 at Card Kingdom, near mint, their price list as of .
Shrewd Hatchling 
Creature — Elemental · 6/6 · Uncommon · Eventide · #112
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.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
4 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Duel Decks: Izzet vs. Golgari | 8 | Uncommon | $0.35 | — |
| Eventide | 112 | Uncommon | $0.35 | $0.49 |
| Modern Masters 2015 | 198 | Uncommon | $0.35 | $0.49 |
| The List | MM2-198 | Uncommon | $0.35 | — |
2 rulings from Wizards of the Coast
- 1 August 2008If you cast a spell that’s both of the listed colors, both abilities will trigger. You’ll remove a total of two -1/-1 counters from the Hatchling.
- 1 August 2008If there are no -1/-1 counters on it when the triggered ability resolves, the ability does nothing. There is no penalty for not being able to remove a counter.