Cheapest priced copy (Amonkhet): $0.35 at Card Kingdom, near mint, their price list as of .
Manticore of the Gauntlet 
Creature — Manticore · 5/4 · Common · Amonkhet · #142
When this creature enters, put a -1/-1 counter on target creature you control. This creature deals 3 damage to target opponent or planeswalker.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Amonkhet | 142 | Common | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 18 April 2017If you can't choose a target opponent when you put Manticore of the Gauntlet's triggered ability on the stack (most likely because your opponents have hexproof), the ability is removed from the stack and you won't put a -1/-1 counter on any creature.
- 18 April 2017If either target becomes illegal after Manticore of the Gauntlet's triggered ability is put onto the stack but before it resolves, the other is still affected as appropriate.