Cheapest priced copy (Outlaws of Thunder Junction): $0.35 at Card Kingdom, near mint, their price list as of .
Trained Arynx 
Creature — Cat Beast Mount · 3/1 · Common · Outlaws of Thunder Junction · #36
Whenever this creature attacks while saddled, it gains first strike until end of turn. Scry 1. (Look at the top card of your library. You may put that card on the bottom.)
Saddle 2 (Tap any number of other creatures you control with total power 2 or more: This Mount becomes saddled until end of turn. Saddle only as a sorcery.)
Legal inCommanderBrawlStandardPioneerModernLegacyVintagePauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Outlaws of Thunder Junction | 36 | Common | $0.35 | $0.49 |
6 rulings from Wizards of the Coast
- 12 April 2024“Saddle N” means “Tap any number of other untapped creatures you control with total power N or greater: This permanent becomes saddled until end of turn. Activate only as a sorcery.”
- 12 April 2024Creatures with saddle can attack or block as normal even if they aren’t saddled.
- 12 April 2024If a permanent becomes a copy of a saddled Mount, the copy won’t be saddled.
- 12 April 2024You may activate a permanent’s saddle ability even if that permanent is already saddled.
- 12 April 2024“Saddled” isn’t an ability that a creature has. It’s just something true about that creature. It won’t stop being saddled until the turn ends or it leaves the battlefield.
- 12 April 2024An ability that triggers when a creature “attacks while saddled” will trigger only if that creature was saddled when it was declared as an attacker.