Banjo Moment

Play only during declare blockers step.
Creatures lose hexproof until end of turn.
Exchange control of target creature you control
with target creature an opponent controls until
end of turn and gain 1 life, then that opponent
may repeat this process. Creatures may be
targeted by Banjo Moment up to once per turn.
"It's a Banjo Moment!" -Bob Belcher, Grill Shaman