Cheapest priced copy (Aetherdrift Commander): $0.59 at Card Kingdom, near mint, their price list as of .
Wizened Mentor 
Creature — Zombie Cleric · 2/2 · Rare · Aetherdrift Commander · #24
Whenever an opponent activates an ability of a permanent that isn't a mana ability, you create a 1/1 white Zombie creature token. This ability triggers only once each turn.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $0.59 to $0.69 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Aetherdrift Commander | 8 | Rare | $0.59 | — |
| Aetherdrift Commander | 24 | Rare | $0.69 | — |