Neighboring Dimension

You and your opponent reveal each other's hand.
You choose a card in their hand and they choose
a card in yours. Exchange those cards. You may
each spend mana as though it were any color to
cast the exchanged spells.
Ever Get The Feeling You've Been Had — As this
spell is cast, write down a card in your hand.
After this spell is resolved, if the opponent chose
the written card, they return it to your hand and discard 2 cards.