Cheapest priced copy (March of the Machine): $0.35 at Card Kingdom, near mint, their price list as of .
Norn's Inquisitor 
Creature — Phyrexian Knight · 1/1 · Uncommon · March of the Machine · #29
When this creature enters, incubate 2. (Create an Incubator token with two +1/+1 counters on it and "{2}: Transform this token." It transforms into a 0/0 Phyrexian artifact creature.)
Whenever a permanent you control transforms into a Phyrexian, put a +1/+1 counter on it.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.35 to $0.59 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| March of the Machine | 29 | Uncommon | $0.35 | $0.49 |
| March of the Machine | 381 | Uncommon | $0.59 | $0.49 |
2 rulings from Wizards of the Coast
- 14 April 2023The last ability of Norn's Inquisitor will trigger if a permanent you control transforms in either direction, going from front face up to back face up or vice versa, as long as it's a Phyrexian after doing so.
- 14 April 2023Only transforming double-faced permanents (including transforming double-faced cards and Incubator tokens) can transform. A face-up permanent turning face down doesn't count as transforming, nor does a face-down permanent turning face up.