Kaalia the Lost

Haste, Vigilance
When Kaalia the Lost enters the battlefield or
attacks you may pay {2} if you do look at the top
card of your library if it's a demon reveal it and
put it in the graveyard if it's an angel reveal it and
put it into your hand. Otherwise, put it back on
top of your library.
"I'll kill the demon. I don't know how yet, but I'll find
a way to make him suffer"— Kaalia