Cheapest priced copy (Onslaught): $0.35 at Card Kingdom, near mint, their price list as of .
Charging Slateback 
Creature — Beast · 4/3 · Common · Onslaught · #194
This creature can't block.
Morph {4}{R} (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 inCommanderLegacyVintagePauper
Not legal inBrawlStandardPioneerModern
1 printing · $0.35 to $0.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Onslaught | 194 | Common | $0.35 | $0.79 |