Cheapest priced copy (Mercadian Masques): $0.59 at Card Kingdom, near mint, their price list as of .
Megatherium 
Creature — Beast · 4/4 · Rare · Mercadian Masques · #259
Trample
When this creature enters, sacrifice it unless you pay {1} for each card in your hand.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $0.59 to $8.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Mercadian Masques | 259 | Rare | $0.59 | $8.99 |