Krhygon, the Benevolent

Ward {2}—When Krhygon, the Benevolent
enters the battlefield, each player draws a card.
Whenever an opponent casts a spell you own in
exile, put a +1/+1 counter on Krhygon.
{u}{b}{g}: Randomly choose target opponent. That opponent reveals their hand. You may exile one
card from your hand and one card from that
opponent's hand. For as long as those cards
remain in exile, you may cast that opponent's
card, and your opponent may cast your card
without paying their mana costs.