Cheapest priced copy (The Lost Caverns of Ixalan): $0.35 at Card Kingdom, near mint, their price list as of .
Burning Sun Cavalry 
Creature — Human Knight · 2/2 · Common · The Lost Caverns of Ixalan · #138
Whenever this creature attacks or blocks while you control a Dinosaur, this creature gets +1/+1 until end of turn.
Legal inCommanderBrawlStandardPioneerModernLegacyVintagePauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| The Lost Caverns of Ixalan | 138 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 10 November 2023If you controlled a Dinosaur when you declared Burning Sun Cavalry as an attacker or blocker, it doesn't matter whether you still control one as its ability resolves. Burning Sun Cavalry will still get +1/+1 until end of turn.