Goat format ruling
Exchange

Card effect (current official text)Both players reveal their hands and add 1 card from each other's hand to their hand.
Rulings
- You cannot activate Exchange if you have no other card in your hand besides Exchange.
- The opponent is still considered the owner of the card you take by the effect of Exchange for all purposes.
- If you take your opponent’s Kuriboh through the effect of Exchange you may discard it to activate its effect (but it is discarded to your opponent’s GY).
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Goat forum — sourced change requests get reviewed.