Vampire Nocturnus {1}{B}{B}{B}
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.
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Cards that do something similar expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Mystic Crusader 82%
$0.40#29430
"As long as there are seven or more cards in your graveyard, this creature gets +1/+1 and has flying."
Mystic Zealot 82%
$0.03#30771
"As long as there are seven or more cards in your graveyard, this creature gets +1/+1 and has flying."
Mystic Penitent 82%
$0.18#30599
"As long as there are seven or more cards in your graveyard, this creature gets +1/+1 and has flying."
Boggart Sprite-Chaser 82%
$0.09#31056
"As long as you control a Faerie, this creature gets +1/+1 and has flying."
Cloister Gargoyle 81%
$0.21#13786
"As long as you've completed a dungeon, this creature gets +3/+0 and has flying."
Cloudreach Cavalry 80%
$0.11#29891
"As long as you control a Bird, this creature gets +2/+2 and has flying."
Dragonloft Idol 80%
$0.26#26330
"As long as you control a Dragon, this creature gets +1/+1 and has flying and trample."
Roc Hatchling 80%
$0.27#29338
"As long as this creature has no shell counters on it, it gets +3/+2 and has flying."