Sulfuric Vortex 
Enchantment
$0.88 #2762 0.63 23.3 years
At the beginning of each player's upkeep, this enchantment deals 2 damage to that player.
If a player would gain life, that player gains no life instead.
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Cards similar to Sulfuric Vortex 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.
Roiling Vortex92%
$1.96↑#24760.45↓5.9 years↓
"At the beginning of each player's upkeep, this enchantment deals 1 damage to them."
+1 more matching line
Rain of Gore88%
$8.06↑#19096↓0.50↓20.3 years↓
"If a spell or ability would cause its controller to gain life, that player loses that much life instead."
Copper Tablet86%
$56.45↑#15363↓0.11↓33.1 years↑
"At the beginning of each player's upkeep, this artifact deals 1 damage to that player."
Tainted Remedy85%
$7.59↑#6710↓0.91↑11.1 years↓
"If an opponent would gain life, that player loses that much life instead."
Plague Drone84%
$2.14↑#6532↓0.75↑3.9 years↓
"If an opponent would gain life, that player loses that much life instead."
Spellshock84%
$2.98↑#5451↓1.33↑28.2 years↑
"Whenever a player casts a spell, this enchantment deals 2 damage to that player."
Panicked Altisaur83%
$0.18↓#13639↓0.07↓2.8 years↓
"
: This creature deals 2 damage to each opponent."
: This creature deals 2 damage to each opponent."
Manabarbs83%
$4.32↑#22151.24↑33.1 years↑
"Whenever a player taps a land for mana, this enchantment deals 1 damage to that player."
Lasting Tarfire82%
$0.25↓#6536↓0.00↓0.6 years↓
"At the beginning of each end step, if you put a counter on a creature this turn, this enchantment deals 2 damage to each opponent."
Rampaging Ferocidon82%
$1.30↑#25100.728.9 years↓
"Whenever another creature enters, this creature deals 1 damage to that creature's controller."
+1 more matching line
Barbed Wire81%
$1.77↑#13458↓0.40↓26.9 years↑
"At the beginning of each player's upkeep, this artifact deals 1 damage to that player."
Forsaken Wastes81%
$14.81↑#14335↓0.87↑29.9 years↑
"At the beginning of each player's upkeep, that player loses 1 life."
+1 more matching line
Rumbling Slum80%
$0.25↓#26639↓0.79↑20.6 years↓
"At the beginning of your upkeep, this creature deals 1 damage to each player."
Quakebringer79%
$1.10↑#8783↓0.20↓5.6 years↓
"At the beginning of your upkeep, this card deals 2 damage to each opponent. This ability triggers only if this card is on the battlefield or if this card is in your graveyard and you control a Giant."
+1 more matching line
Giant Cindermaw79%
$0.10↓#10791↓0.17↓3.8 years↓
"Players can't gain life."
Glassworks // Shattered Yard78%
$0.20↓#8782↓0.19↓1.9 years↓
"At the beginning of your end step, this Room deals 1 damage to each opponent."
Pyrostatic Pillar78%
$2.77↑#12176↓0.6223.3 years
"Whenever a player casts a spell with mana value 3 or less, this enchantment deals 2 damage to that player."
Atarka's Command78%
$1.14↑#6564↓0.27↓11.4 years↓
"• this card deals 3 damage to each opponent."
+1 more matching line
Impatience78%
$0.29↓#22786↓0.31↓27.2 years↑
"At the beginning of each player's end step, if that player didn't cast a spell this turn, this enchantment deals 2 damage to that player."
Storm World77%
$44.70↑#26198↓0.33↓32.3 years↑
"At the beginning of each player's upkeep, this enchantment deals X damage to that player, where X is 4 minus the number of cards in their hand."