Cheapest priced copy (Aetherdrift): $0.35 at Card Kingdom, near mint, their price list as of .
Spire Mechcycle 
Artifact — Vehicle · 5/4 · Uncommon · Aetherdrift · #314
Haste
Exhaust — Tap another untapped Mount or Vehicle you control: This Vehicle becomes an artifact creature. Put a +1/+1 counter on it for each Mount and/or Vehicle you control other than this Vehicle. (Activate each exhaust ability only once.)
Crew 2
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Aetherdrift | 147 | Uncommon | $0.35 | $0.49 |
| Aetherdrift | 314 | Uncommon | $0.35 | $0.49 |
3 rulings from Wizards of the Coast
- 7 February 2025If an ability triggers whenever you activate an exhaust ability, that ability resolves before the exhaust ability resolves.
- 7 February 2025Exhaust abilities can be activated any time you could normally activate an ability.
- 7 February 2025If an exhaust ability of a permanent is activated, and then that permanent leaves the battlefield and returns to the battlefield, it becomes a new object so its exhaust ability can be activated again.