Legerdemain

Sorcery, 2UU (4)
Exchange control of target artifact or creature and another target permanent that shares one of those types with it. (This effect lasts indefinitely.)¹
Squee tucked the warm ball in his pocket and slipped a pebble in its place. 'Glok, ' he mumbled, and hid.
Illus. Daren Bader

Gatherer Card Rulings [Nov 2009]

• 4/1/2008: You can't cast Legerdemain unless both targets share a type at that time. It will also check to make sure they share a type as it resolves. If they no longer do so, the exchange will not occur.

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