REDU format ruling
Morphtronic Magnen

Nearest-era rulings (Tengu, Sept 2011) — no REDU-specific archive exists.
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.
Rulings
- If you control an Attack Position Morphtronic Magnen and another monster, when your opponent attacks the other monster and and effect is activated that changes Morphtronic Magnen into Defense Position, the other monster is still attacked because it has already been selected as an attack target.
- While Skill Drain is active, the Attack Position and Defense Position effects of Morphtronic Magnen cannot be activated, because the While in Attack Position and While in Defense Position effects are negated.
- If your opponent controls Command Knight and another monster with less ATK, your Morphtronic Magnen cannot attack because it cannot attack the Command Knight.
- If your opponent controls a monster equipped with Ring of Magnetism and another monster with higher ATK, your Morphtronic Magnen must attack the monster equipped with Ring of Magnetism if it attacks.
- If you control 2 or more Morphtronic Magnens in Defense Position, your opponent cannot attack, unless they control a monster that can attack directly due to an effect.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the REDU forum — sourced change requests get reviewed.