Vampire Magician

Deathtouch, vigilance
Unbound {2}{b}{b}({2}{b}{b}: Put this
creature onto the battlefield from your
hand. Unbound only at any time you
could activate a sorcery.)
When Vampire Magician's Unbound cost is
paid, target 2 monsters your opponent controls.
Their power and toughness are switched until
end of turn.