15 cards where the text includes “you and target opponent” and (the card is available on Paper) and it’s legal in Commander

Expert-Level Safe (Fallout #133)
Farsight Adept (Zendikar Rising #14)
Flumph (Adventures in the Forgotten Realms #15)
Keen Duelist (Commander 2021 #42)
Loran of the Third Path (Murders at Karlov Manor Commander #71)
Love Song of Night and Day (Commander Masters #827)
Malik, Grim Manipulator (Universes Within #23)
Mana Clash (Ninth Edition #203)
Oath of the Grey Host (The Lord of the Rings: Tales of Middle-earth #101)
Secret Rendezvous (Strixhaven: School of Mages #26)
Sky Crier (Streets of New Capenna #31)
Teyo, Geometric Tactician (Commander Masters #725)
Thran Spider (The Brothers' War #254)
Twist Allegiance (Betrayers of Kamigawa #120)
Your Temple Is Under Attack (Commander Legends: Battle for Baldur's Gate #52)

The message was clear to Sorin—time to search for something else.