Big Spook in the Dark

Shroud, Trample, First Strike,
protection from white.
If a creature enters the battlefield under your
control, you may sacrifice it. If you do, this gains
+2/+2 and you may draw two cards.
Before you draw a card not on your turn, you may reveal it. If its a creature, instead of drawing it,
exile it and destroy target creature with power
less than the reveal creature's.