Soul Strike

Yu-Gi-Oh Card: Soul Strike
Available from these partners:
Soul Strike
Type:Normal Trap
Text:If your LP is 4000 or less, when an attack is declared involving a monster you control and an opponent's monster: Pay half your LP, then target 1 face-up monster you control; it gains ATK equal to the deficit between your current LP and 4000. You can only activate 1 "Soul Strike" per turn.
Printings: 2015 Mega-Tin Mega Pack (MP15-EN247)
Secrets of Eternity (SECE-EN099)