Idaan, Courtly Tergiversator

Whenever Idaan becomes the target of a spell or ability you don't control, until that spell or
ability's controller's next turn, creatures you
don't control attack that spell or ability's
controller each combat if able.
At the beginning of each player's end step, that
player chooses a player except Idaan's owner.
Until the next end step, creatures you don't
control attack the chosen player each combat if
able.