Cheapest priced copy (March of the Machine): $0.69 at Card Kingdom, near mint, their price list as of .
Essence of Orthodoxy 
Creature — Phyrexian · 3/3 · Rare · March of the Machine · #323
Flying
Whenever this creature or another Phyrexian you control 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.)
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.69 to $3.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| March of the Machine | 323 | Rare | $0.69 | $3.99 |
| March of the Machine | 376 | Rare | $0.69 | — |