Duskmantle Seer 
Creature — Vampire Wizard
$0.24 #13350 0.26 13.6 years
Flying
At the beginning of your upkeep, each player reveals the top card of their library, loses life equal to that card's mana value, then puts it into their hand.
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Cards similar to Duskmantle Seer 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.
Parker Luck92%
$0.31↑#8719↑0.331.0 years↓
"At the beginning of your end step, two target players each reveal the top card of their library. They each lose life equal to the mana value of the card revealed by the other player. Then they each put the card they revealed into their hand."
Dark Tutelage90%
$0.23↓#5903↑0.07↓16.1 years↑
"At the beginning of your upkeep, reveal the top card of your library and put that card into your hand. You lose life equal to its mana value."
Keen Duelist90%
$0.34↑#3188↑0.245.4 years↓
"At the beginning of your upkeep, you and target opponent each reveal the top card of your library. You each lose life equal to the mana value of the card revealed by the other player. You each put the card you revealed into your hand."
Caustic Bronco89%
$0.36↑#6560↑0.04↓2.4 years↓
"Whenever this creature attacks, reveal the top card of your library and put it into your hand. You lose life equal to that card's mana value if this creature isn't saddled. Otherwise, each opponent loses that much life."
Ruin Raider84%
$0.26↑#17857↓0.00↓8.9 years↓
"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."
Pain Seer84%
$0.22↓#17331↓0.2012.6 years
"Whenever this creature becomes untapped, reveal the top card of your library and put that card into your hand. You lose life equal to that card's mana value."
Darkstar Augur83%
$0.40↑#3147↑0.202.1 years↓
"At the beginning of your upkeep, reveal the top card of your library and put that card into your hand. You lose life equal to its mana value."
Baneful Omen82%
$1.88↑#9957↑0.2416.4 years↑
"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."
Sorin the Mirthless80%
$2.47↑#8061↑0.56↑4.8 years↓
"+1: Look at the top card of your library. You may reveal that card and put it into your hand. If you do, you lose life equal to its mana value."
Spellbound Dragon78%
$0.34↑#20768↓0.61↑17.3 years↑
"Flying"
Twilight Prophet78%
$1.74↑#1122↑0.298.6 years↓
"At the beginning of your upkeep, if you have the city's blessing, reveal the top card of your library and put it into your hand. Each opponent loses X life and you gain X life, where X is that card's mana value."
Protection Racket76%
$3.73↑#7095↑0.58↑4.4 years↓
"At the beginning of your upkeep, repeat the following process for each opponent in turn order. Reveal the top card of your library. That player may pay life equal to that card's mana value. If they do, exile that card. Otherwise, put it into your hand."
Stronghold Arena76%
$0.17↓#17997↓0.00↓4.0 years↓
"Whenever one or more creatures you control deal combat damage to a player, you may reveal the top card of your library and put it into your hand. If you do, you lose life equal to its mana value."
Raven of Fell Omens76%
$0.20↓#114570.06↓2.4 years↓
"Flying"
Sorin, Grim Nemesis74%
$3.61↑#9707↑0.67↑10.4 years↓
"+1: Reveal the top card of your library and put that card into your hand. Each opponent loses life equal to its mana value."
Stormfist Crusader74%
$0.41↑#1941↑0.176.9 years↓
"At the beginning of your upkeep, each player draws a card and loses 1 life."
Bloodhunter Bat74%
$0.05↓#17632↓0.00↓14.1 years
"Flying"
Dark Confidant74%
$4.41↑#1238↑0.39↑20.9 years↑
"At the beginning of your upkeep, reveal the top card of your library and put that card into your hand. You lose life equal to its mana value."
Seizan, Perverter of Truth72%
$1.88↑#3610↑0.2021.9 years↑
"At the beginning of each player's upkeep, that player loses 2 life and draws two cards."
Hoard-Smelter Dragon72%
$0.17↓#9544↑0.06↓15.9 years↑
"Flying"