Unstable Evolution

Yu-Gi-Oh Card: Unstable Evolution
Available from these partners:
Unstable Evolution
Type:Equip Spell
Text:While your Life Points are lower than your opponent's, the equipped monster's original ATK becomes 2400. While your Life Points are higher than your opponent's, its original ATK becomes 1000.
Printings: Battle Pack 3: Monster League (BP03-EN157)
The Duelist Genesis (TDGS-EN060)
Yu-Gi-Oh! 5D's Starter Deck 2009 (5DS2-EN030)