Cheapest priced copy (Tales of Middle-earth Commander): $3.49 at Card Kingdom, near mint, their price list as of .
Fell Beast of Mordor 
Creature — Drake Beast · 3/3 · Rare · Tales of Middle-earth Commander · #513
Flying
Devour 1 (As this creature enters, you may sacrifice any number of creatures. It enters with that many +1/+1 counters on it.)
Whenever this creature enters or attacks, target opponent loses X life and you gain X life, where X is the number of +1/+1 counters on it.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $2.99 to $7.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Tales of Middle-earth Commander | 513 | Rare | $3.49 | $2.99 |
| Tales of Middle-earth Commander | 557 | Rare | — | $7.99 |
2 rulings from Wizards of the Coast
- 3 November 2023If Fell Beast of Mordor isn't on the battlefield as its ability resolves, use the number of +1/+1 counters that were on it when it was last on the battlefield to determine the value of X.
- 3 November 2023Fell Beast of Mordor can't devour creatures entering the battlefield at the same time as it.