Enslaving Succubus

Flying
You may exert Enslaving Succubus as it attacks.
When you do, if Enslaving Succubus deals 5 or
more combat damage to defending player this
turn, you gain control of that player during that
player's next turn. After that turn, that player
takes an extra turn. (An exerted creature won't
untap during your next untap step. You see all cards
that player could see and make all decisions for the
player.)