Baneful Omen {4}{B}{B}{B}
Enchantment
At the beginning of your end step, you may reveal the top card of your library. If you do, each opponent loses life equal to that card's mana value.
click a line to search just that ability, click more to combine them
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.
Primordial Mist 87%
$0.28#6539
"At the beginning of your end step, you may manifest the top card of your library."
Aid from the Cowl 86%
$0.33#10682
"At the beginning of your end step, if a permanent left the battlefield under your control this turn, reveal the top card of your library. If it's a permanent card, you may put it onto the battlefield. Otherwise, you may put it on the bottom of your library."
Ruin Raider 85%
$0.18#17435
"At the beginning of your end step, if you attacked this turn, reveal the top card of your library and put that card into your hand. You lose life equal to the card's mana value."