Advanced format ruling
Unstable Evolution
Card effect (current official text)While your LP is lower than your opponent's, the equipped monster's original ATK becomes 2400. While your LP is higher, the equipped monster's original ATK becomes 1000.
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.