Cheapest priced copy (Rivals of Ixalan): $9.49 at Card Kingdom, near mint, their price list as of .
Trapjaw Tyrant 
Creature — Dinosaur · 5/5 · Mythic · Rivals of Ixalan · #29
Enrage — Whenever this creature is dealt damage, exile target creature an opponent controls until this creature leaves the battlefield.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $9.49 to $10.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Rivals of Ixalan Promos | 29s | Mythic | — | $10.99 |
| Rivals of Ixalan | 29 | Mythic | $9.49 | $9.99 |
5 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 a token is exiled this way, it will cease to exist and won’t return to the battlefield.
- 19 January 2018If Trapjaw Tyrant leaves the battlefield before its triggered ability resolves (most likely because it was dealt lethal damage), the target creature won’t be exiled.
- 19 January 2018Auras attached to the exiled creature will be put into their owners’ graveyards. Any Equipment will become unattached and remain on the battlefield. Any counters on the exiled creature will cease to exist.
- 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.