Unbreakable Spirit is a Common Trap Card card from Yu-Gi-Oh! (Speed Duel: Battle City Box, SBCB). Current market price: $0.09.
Common
Speed Duel: Battle City Box (SBCB)
Card Text
If you control only 1 face-up monster: Target that monster; until the end of this turn, it gains ATK equal to the ATK of the monster your opponent currently controls with the lowest ATK (your choice, if tied).
