Cheapest priced copy (Modern Horizons 3): $0.35 at Card Kingdom, near mint, their price list as of .
Thriving Skyclaw 
Creature — Cat Dragon · 3/2 · Common · Modern Horizons 3 · #141
Flying
When this creature enters, you get {E}{E}{E} (three energy counters).
Whenever this creature attacks, you may pay {E}{E}{E}. If you do, put a +1/+1 counter on it.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Modern Horizons 3 | 141 | Common | $0.35 | $0.49 |