Cheapest priced copy (Commander Legends): $0.35 at Card Kingdom, near mint, their price list as of .
Slith Ascendant 
Creature — Slith · 1/1 · Uncommon · Mirrodin · #23
Flying
Whenever this creature deals combat damage to a player, put a +1/+1 counter on it.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander Legends | 49 | Common | $0.35 | $0.49 |
| Mirrodin | 23 | Uncommon | $0.35 | $0.49 |