Cheapest priced copy (The List): $0.49 at Card Kingdom, near mint, their price list as of .
Needletooth Raptor 
Creature — Dinosaur · 2/2 · Uncommon · Rivals of Ixalan · #107
Enrage — Whenever this creature is dealt damage, it deals 5 damage to target creature an opponent controls.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.49 to $1.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| The List | RIX-107 | Uncommon | $0.49 | — |
| Rivals of Ixalan | 107 | Uncommon | $0.59 | $1.99 |
2 rulings from Wizards of the Coast
- 19 January 2018If multiple sources deal damage to a creature with an enrage ability at the same time, most likely because multiple creatures blocked that creature, the enrage ability triggers only once.
- 19 January 2018If lethal damage is dealt to a creature with an enrage ability, that ability triggers. The creature with that enrage ability leaves the battlefield before that ability resolves, so it won’t be affected by the resolving ability.