Cheapest priced copy (Throne of Eldraine): $1.49 at Card Kingdom, near mint, their price list as of .
Thorn Mammoth 
Creature — Elephant · 6/6 · Rare · Throne of Eldraine · #323
Trample
Whenever this creature or another creature you control enters, this creature fights up to one target creature you don't control.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $1.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Throne of Eldraine | 323 | Rare | $1.49 | — |
| The List | ELD-323 | Rare | $1.49 | — |
One ruling from Wizards of the Coast
- 4 October 2019If the target creature is an illegal target when Thorn Mammoth's last ability tries to resolve, the ability doesn't resolve. If Thorn Mammoth is no longer on the battlefield, the target creature won't deal or be dealt damage.