Cheapest priced copy (Onslaught): $0.35 at Card Kingdom, near mint, their price list as of .
Thrashing Mudspawn 
Creature — Beast · 4/4 · Uncommon · Onslaught · #177
Whenever this creature is dealt damage, you lose that much life.
Morph {1}{B}{B} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Onslaught | 177 | Uncommon | $0.35 | $0.49 |