Legerdemain

Sorcery    (CMC:4)

Exchange control of target artifact or creature and another target permanent that shares one of those types with it. (This effect lasts indefinitely.)

Squee tucked the warm ball in his pocket and slipped a pebble in its place. "Glok," he mumbled, and hid.

57 TPR • ENDaren Bader

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Legal in: Tempest Block,Legacy,Vintage,Commander

Oracle Text (click to copy):

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.