Whenever a creature enters, it gains double strike and haste until end of turn.
Whenever chaos ensues, exile target nontoken creature you control, then return it to the battlefield under your control.
If a creature you've gained control of temporarily (because of Act of Treason, for example) is exiled and returns to the battlefield under your control, you will control that creature indefinitely.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.