FOILCheapest priced copy (The List): $0.79 at Card Kingdom, near mint, their price list as of .
March of the Machines 
Enchantment · Rare · Tenth Edition · #91★
Each noncreature artifact is an artifact creature with power and toughness each equal to its mana value. (Equipment that's a creature can't equip a creature.)
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
5 printings · $0.79 to $12.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Tenth Edition | 91 | Rare | $1.49 | — |
| Tenth Edition | 91★ | Rare | — | $11.99 |
| Archenemy | 6 | Rare | $1.29 | — |
| Mirrodin | 42 | Rare | $0.99 | $12.99 |
| The List | MRD-42 | Rare | $0.79 | — |
5 rulings from Wizards of the Coast
- 1 December 2004If an Equipment becomes a creature, it can no longer equip a creature. If it's currently attached to a creature, it becomes unattached (but remains on the battlefield). You can activate the Equipment's equip ability, but it won't do anything.
- 1 December 2004If a noncreature artifact is also another card type, such as enchantment or land, it will retain those types in addition to being an artifact creature.
- 1 December 2004Each artifact land has a mana value of 0. March of the Machines makes them 0/0 creatures, which are put into the graveyard as a state-based action.
- 15 July 2007If a noncreature artifact becomes an artifact creature this way and then another effect animates it, the new effect overrides March of the Machines's effect. For example, Chimeric Staff is a 4/4 creature while March of the Machines is on the battlefield. If you activate Chimeric Staff's ability and choose X = 5, Chimeric Staff will be a 5/5 artifact creature for the rest of the turn.
- 1 October 2009A noncreature permanent that turns into a creature is subject to the "summoning sickness" rule: It can only attack, and its {T} abilities can only be activated, if its controller has continuously controlled that permanent since the beginning of their most recent turn.