Ellvanwin, the Manipulator

Flash, Deathtouch, Lifelink
Whenever a creature you control becomes the
target of a spell or ability an opponent controls,
you may pay {u}{b}. If you do, choose a new target
for the spell or ability.
Whenever Ellvanwin, the Manipulator blocks,
you may gain control of the blocked creature
until the end of your next turn.
Permanents you control that you don't own have hexproof.