Nebula, Dark Angel

Flying, haste
When Nebula, Dark Angel enters the battlefield,
you may search your library for a Demon card,
reveal it, and put it into your hand. If you do,
shuffle your library.
At the beginning of combat on your turn, you
may sacrifice a creature. If you do, Nebula and
each Demon creature you control get +2/+1
until end of turn.