Number 25: Force Focus (Starfoil) (SP14-EN026) [Star Pack 2014]

2 Level 6 monsters // Once per turn, during either player's turn: You can detach 1 Xyz Material from this card to target 1 face-up Level 5 or higher Effect Monster your opponent controls; negate the effect(s) of that opponent's face-up monster until the end of this turn.