Chameleos, Mist Dragon

Flying, deathtouch, poisonous 3 (Whenever this
creature deals combat damage to a player, that player
gets 3 poison counters.)
Whenever an opponent casts an instant or sorcery
spell that targets Chameleos, you gain control of
that spell, you may choose new targets for it.
"Most dragons settle for picking you appart, but
apparently this one likes to pick your pockets too"
—Some Foreign Hunter