Shallan Davar, Three-Faced

At the beginning of your upkeep, exile the top two cards of target opponent's library. You may play
them this turn. Whenever you play a card exiled
this way, put a sanity counter on Shallan Davar, Three-Faced. If she has five or more sanity counters on her, exile her, then return her to the battlefield transformed under her owner's control.
"I have this uncanny ability to hide away anything I don't want to think about. It . . . it's getting harder, but for most things, I can just . . . there.
Gone.