Coupling Crystal

{2}{t}: Create a Coupling artifact token under
your control. It has, "{1}{t}: Tap or untap target
permanent you control".
Duplicate—{1}{u}{t}, Sacrifice Coupling Crystal:
Create a copy of any number of artifact tokens in
play that you control. Pay {1} and 1 Life for each
copy created, otherwise destroy it and the original
it was copied from at the end of turn.
Buyback {u}{u}.