Bolas

Eminence - At the beginning of each opponent's
turn, look at the top card of that player's library.
Put that card on the bottom unless you pay 1 life.
Flash, flying, haste
When you cast Bolas, gain control of each player
and the spells they cast until end of turn. (Their
spells resolve onto the battlefield under your control.)
Appease {7}{u}{b}{r}.