Cheapest priced copy (Kaladesh): $0.35 at Card Kingdom, near mint, their price list as of .
Bastion Mastodon 
Artifact Creature — Elephant · 4/5 · Common · Kaladesh · #197
{W}: This creature gains vigilance until end of turn.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Kaladesh | 197 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 20 September 2016Once Bastion Mastodon is tapped and attacking, gaining vigilance won't cause it to become untapped.