Caith Sith, Fortune Teller

Lucky Slots — At the beginning of combat
on your turn, scry 1, then exile the top card
of your library. You may play that card this
turn. When you exile a card this way, target creature you control gets +X/+0 until end
of turn, where X is that card's mana value.

"I'm friend to one and all, thanks to my crystal
ball!"