Advanced format ruling
Sword of the Soul-Eater
Card effect (current official text)You can only equip this card to a Level 3 or lower Normal Monster on your side of the field. When you activate this card, Tribute all Normal Monsters (except Tokens) on your side of the field, except the equipped monster. Increase the ATK of the equipped monster by 1000 points for each Normal Monster that you Tributed.
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.