Baneful Omen 
Enchantment
$1.88 #9957 0.24 16.4 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.
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Cards similar to Baneful Omen 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.
Keen Duelist84%
$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."
Duskmantle Seer82%
$0.24↓#13350↓0.2613.6 years↓
"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."
Twilight Prophet80%
$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 Racket79%
$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."
Sorin, Grim Nemesis78%
$3.61↑#97070.67↑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."
Caustic Bronco76%
$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."
Parker Luck74%
$0.31↓#87190.331.0 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."
Naya Soulbeast73%
$0.27↓#24512↓0.2412.8 years↓
"When you cast this spell, each player reveals the top card of their library. This creature enters with X +1/+1 counters on it, where X is the total mana value of all cards revealed this way."
God-Pharaoh's Statue72%
$0.64↓#2408↑1.32↑7.3 years↓
"At the beginning of your end step, each opponent loses 1 life."
Yuriko, the Tiger's Shadow72%
$3.49↑#2479↑2.15↑8.1 years↓
"Whenever a Ninja you control deals combat damage to a player, reveal the top card of your library and put that card into your hand. Each opponent loses life equal to that card's mana value."
Engine Rat72%
$0.26↓#92150.191.6 years↓
"
: Each opponent loses 2 life."
: Each opponent loses 2 life."
Archers' Parapet70%
$0.08↓#18805↓0.43↑11.9 years↓
"
, 
: Each opponent loses 1 life."
, : Each opponent loses 1 life."
Nightshade Schemers70%
$0.31↓#23244↓0.2918.6 years↑
"At the beginning of your upkeep, you may look at the top card of your library. If it shares a creature type with this creature, you may reveal it. If you do, each opponent loses 2 life."
Maggot Carrier70%
$0.15↓#22542↓0.2425.6 years↑
"When this creature enters, each player loses 1 life."
Blood-Toll Harpy70%
$0.03↓#28363↓0.3312.9 years↓
"When this creature enters, each player loses 1 life."
Howling Banshee70%
$0.05↓#24930↓0.2417.1 years
"When this creature enters, each player loses 3 life."
Rabid Bloodsucker70%
$0.08↓#27217↓0.2111.1 years↓
"When this creature enters, each player loses 2 life."