"Morphtronic Mix-up" targets 2 cards at activation. Your opponent picks a card at resolution. If something happened during the chain to remove 1 of the 2 cards, the remaining card is automatically chosen.
"Morphtronic Mix-up" targets 2 cards at activation. Your opponent picks a card at resolution. If something happened during the chain to remove 1 of the 2 cards, the remaining card is automatically chosen.