K9-66X "Jacks" is a Super Rare XYZ Monster card from Yu-Gi-Oh! (Doom of Dimensions, DOOD). Current market price: $0.31.
Super Rare
Doom of Dimensions (DOOD)
Card Text
2 Level 5 monsters
If this card is Xyz Summoned, or if your opponent activates a monster effect in the hand or GY: You can detach 1 material from this card, then target 1 monster on the field; destroy it. You can only use this effect of "K9-66X "Jacks"" once per turn. A "K9" Xyz Monster that has this card as material gains this effect.
● During any turn in which your opponent has activated a monster effect in the hand or GY, any battle damage this card inflicts to your opponent is doubled.
