Karma

{r}{t}: Flip a coin. If heads, gain control of
target creature until end of turn. Untap that
creature. It gains haste until end of turn. (When
controlled creature attacks or blocks this turn,
treat karma as an attacking or blocking creature
as well.) Play this ability only as a sorcery.
If Karma leaves the battlefield, controlled
creature reverts back to its owners control and
deals no damage this turn.