Vampire Nocturnus
Creature — Vampire
Play with the top card of your library revealed.
As long as the top card of your library is black, this creature and other Vampire creatures you control get +2/+1 and have flying.
"Your life will set with the sun."
Jason Felix
Rulings
If the top card of your library is black, Vampire Nocturnus will give itself +2/+1 and flying even if it's somehow not a Vampire.
(wotc • 2013-07-01)
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.
(wotc • 2013-04-15)
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.
(wotc • 2013-04-15)
If the top card of your library changes while you're casting a spell, playing a land, or activating an ability, the new top card won't be revealed until you finish doing so.
(wotc • 2013-04-15)
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.
(wotc • 2009-10-01)
Rulings
If the top card of your library is black, Vampire Nocturnus will give itself +2/+1 and flying even if it's somehow not a Vampire.
(wotc • 2013-07-01)
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.
(wotc • 2013-04-15)
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.
(wotc • 2013-04-15)
If the top card of your library changes while you're casting a spell, playing a land, or activating an ability, the new top card won't be revealed until you finish doing so.
(wotc • 2013-04-15)
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.
(wotc • 2009-10-01)