The Ruby Throne

When The Ruby Throne enters the battlefield,
search your library for any creature card, reveal
it and put it on The Ruby Throne face-down.
Then shuffle your library. You may put that
creature on the battlefield (still face-down) as a legendary 4/4 Melnibonean King creature with
"Other creatures you control get +2/+2."
If The Ruby Throne is destroyed, exile that
creature. You may cast that creature from your
exile.