Cheapest priced copy (Fate Reforged): $0.35 at Card Kingdom, near mint, their price list as of .
Frontier Mastodon 
Creature — Elephant · 3/2 · Common · Fate Reforged · #130
Ferocious — This creature enters with a +1/+1 counter on it if you control a creature with power 4 or greater.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
3 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Fate Reforged | 130 | Common | $0.35 | $0.49 |
| Jumpstart 2022 | 663 | Common | $0.35 | — |
| The List | FRF-130 | Common | $0.35 | — |
One ruling from Wizards of the Coast
- 24 November 2014Frontier Mastodon's ferocious ability checks if you control a creature with power 4 or greater as Frontier Mastodon enters the battlefield. Because Frontier Mastodon isn't on the battlefield at this time, it won't count itself.