Zapzo, the Mischievous Clown

Whenever Zapzo, the Mischievous Mechclown
enters the battlefield or attacks, you may exchange
control of target creature you control and target
creature an opponent controls. If you do,
tap those creatures.
{u}{r}: Zapzo gains haste until end of turn.
"Zapzo's circus of chaos brings laughter and
confusion to all who dare to watch."