Vampire Nocturnus

Creature — Vampire    (CMC:4)

Play with the top card of your library revealed. As long as the top card of your library is black, Vampire Nocturnus and other Vampire creatures you control get +2/+1 and have flying.

"Your life will set with the sun."

118 M10 • ENRaymond Swanland

™ & © 1993—2009 Wizards of the Coast

Legal in: Modern,Extended,Legacy,Vintage,Freeform,Prismatic,Tribal Wars Legacy,Tribal Wars Standard,Classic,Singleton 100,Commander

Oracle Text (click to copy):

10/1/2009
To work as an evasion ability, an attacking creature must already have flying when the declare blockers step begins. Once a creature has become blocked, giving it flying won't change that.
4/15/2013
The top card of your library isn't in your hand, so you can't suspend it, cycle it, discard it, or activate any of its activated abilities.
4/15/2013
If the top card of your library changes while you're casting a spell or activating an ability, the new top card won't be revealed until you finish casting that spell or activating that ability.
4/15/2013
When playing with the top card of your library revealed, if an effect tells you to draw several cards, reveal each one before you draw it.