Zaraxis, Fractured Schemer

Flash

When Zaraxis enters the battlefield, choose two —
• Exchange control of target nonland permanent and target spell that opponent controls.
• Copy target activated or triggered ability. You may choose new targets for the copy.
• The next time target spell would resolve this turn, exile it instead. During its controller’s next upkeep, you may cast it without paying its mana cost.

"Forget who’s writing the plan, and it falls apart."