Gain control of target creature until end of turn. Untap that creature. It gains haste until end of turn. Scry 1. (Look at the top card of your library. You may put that card on the bottom of your library.)
9/15/2013 Portent of Betrayal can target any creature, even one that’s untapped or one you already control.
9/15/2013 Gaining control of a creature doesn’t cause you to gain control of any Auras or Equipment attached to it, although those permanents will stay attached to the creature.
9/15/2013 When you scry, you may put all the cards you look at back on top of your library, you may put all of those cards on the bottom of your library, or you may put some of those cards on top and the rest of them on the bottom.
9/15/2013 You choose how to order cards returned to your library after scrying no matter where you put them.
9/15/2013 You perform the actions stated on a card in sequence. For some spells and abilities, that means you’ll scry last. For others, that means you’ll scry and then perform other actions.
9/15/2013 Scry appears on some spells and abilities with one or more targets. If all of the spell or ability’s targets are illegal when it tries to resolve, it won’t resolve and none of its effects will happen. You won’t scry.