Obi-Wan Kenobi

Vigilance, exalted (Whenever a creature
you control attacks alone, that creature gets
+1+1 until end of turn.)
You may look at the top card of your library
any time. Whenever a creature you control
attacks alone, you may cast a spell from the top
of your library.
{2}: Target creature phases out. (Activate only
once each turn.)