Standardize

Instant, UU (2)
Choose a creature type other than Wall. Each creature becomes that type until end of turn.¹
At that point, the wizards' argument got a lot uglier.
Illus. Justin Sweet

Gatherer Card Rulings [Nov 2009]

• 10/4/2004: This spell only affects creatures on the battlefield when it resolves.

Format Legality	Legal in Vintage, Legacy, MTGO Classic Banned in Extended, Standard
Printings (1/6)	Onslaught (Rare)