Advanced format ruling
Diffusion Wave-Motion
Card effect (current official text)(This card is not treated as a "Fusion" card.)
If your opponent controls a monster: Pay 1000 LP, then target 1 Level 7 or higher Spellcaster monster you control; this turn, it must attack all monsters your opponent controls once each, also other monsters you control cannot attack. The effects of monsters destroyed by these attacks cannot activate and are negated.
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.