Divisive Revelation

Target opponent puts the top 5 cards of their library into their graveyard. If you control a creature that's a copy of a creature that opponent controls, that player puts the top 20 cards of their library into their graveyard instead.
"Emmara has brought Jace within my grasp, and my exposure has only sowed more dissent among the Conclave. Every feud brings us closer to our goal."
-Lazav