Cheapest priced copy (March of the Machine Commander): $0.69 at Card Kingdom, near mint, their price list as of .
Excise the Imperfect 
Instant · Rare · March of the Machine Commander · #101
Exile target nonland permanent. Its controller incubates X, where X is its mana value. (They create an Incubator token with X +1/+1 counters on it and "{2}: Transform this token." It transforms into a 0/0 Phyrexian artifact creature.)
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $0.69 to $1.29 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| March of the Machine Commander | 14 | Rare | $0.69 | — |
| March of the Machine Commander | 101 | Rare | $1.29 | — |
One ruling from Wizards of the Coast
- 14 April 2023If the nonland permanent is an illegal target at the time Excise the Imperfect tries to resolve, it won't resolve and none of its effects will happen. Its controller won't incubate.