Advanced format ruling
Morphtronic Magnen
Card effect (current official text)● While in Attack Position: If your opponent controls a face-up monster, this card can only select their highest ATK monster as an attack target. ● While in Defense Position: Your opponent cannot select another monster as an attack target.
Current rulings for this card are maintained by Konami.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Advanced forum — sourced change requests get reviewed.