Advanced format ruling
Rare Metalmorph
Card effect (current official text)Activate this card by targeting 1 Machine-Type monster on the field; it gains 500 ATK. Once, negate a Spell effect that targets that monster. When that monster leaves the field, destroy this card.
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.