Dom master theif

Dom, master theif's color identify is all 5 colors
You may not cast spells.
You get to play first
If Dom, Master Thief is in your
command zone At the beginning of your upkeep
choose an opponent at random.
untill your next turn when ever
that player puts a spell on the stack
you may put a card from your hand
with equal or more cmc on the
stack you exchange spells.