Imminent Doom 
Enchantment
$0.13 #25326 0.21 9.3 years
This enchantment enters with a doom counter on it.
Whenever you cast a spell with mana value equal to the number of doom counters on this enchantment, this enchantment deals that much damage to any target. Then put a doom counter on this enchantment.
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Cards similar to Imminent Doom 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.
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Embersmith86%
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"Whenever you cast an artifact spell, you may pay 
. If you do, this creature deals 1 damage to any target."
. If you do, this creature deals 1 damage to any target."
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$0.12↓#269460.126.7 years↓
"Whenever you cast your first spell during each opponent's turn, this creature deals 1 damage to any target."
Pyromancer's Assault85%
$0.11↓#231070.1110.7 years↑
"Whenever you cast your second spell each turn, this enchantment deals 2 damage to any target."
Labyrinth Champion85%
$0.17↑#252560.07↓13.1 years↑
"Whenever you cast a spell that targets this creature, this creature deals 2 damage to any target."
Burning Vengeance84%
$0.12↓#13147↑0.1215.1 years↑
"Whenever you cast a spell from your graveyard, this enchantment deals 2 damage to any target."
Pyroconvergence84%
$0.14↑#266810.2514.0 years↑
"Whenever you cast a multicolored spell, this enchantment deals 2 damage to any target."
Rumbling Aftershocks84%
$0.07↓#30896↓0.07↓16.7 years↑
"Whenever you cast a kicked spell, you may have this enchantment deal damage to any target equal to the number of times that spell was kicked."
Knollspine Invocation82%
$0.37↑#302740.07↓18.5 years↑
"
, Discard a card with mana value X: This enchantment deals X damage to any target."
, Discard a card with mana value X: This enchantment deals X damage to any target."
Kamahl, Pit Fighter82%
$0.20↑#18568↑0.1325.1 years↑
"
: this card deals 3 damage to any target."
: this card deals 3 damage to any target."
Mana Cannons81%
$0.57↑#9707↑0.204.1 years↓
"Whenever you cast a multicolored spell, this enchantment deals X damage to any target, where X is the number of colors that spell is."
Surtr, Fiery Jötun81%
$10.52↑#7429↑0.292.3 years↓
"Whenever you cast a historic spell, this card deals 3 damage to any target."
Monoskelion80%
$0.13#18924↑0.00↓5.3 years↓
"This creature enters with a +1/+1 counter on it."
+1 more matching line
Molten Nursery80%
$0.15↑#234410.1111.0 years↑
"Whenever you cast a colorless spell, this enchantment deals 1 damage to any target."
Magmatic Force80%
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"At the beginning of each upkeep, this creature deals 3 damage to any target."
Aladdin's Ring80%
$0.26↑#249590.1932.8 years↑
"
, : This artifact deals 4 damage to any target."
, : This artifact deals 4 damage to any target."
Sarkhan's Unsealing80%
$1.03↑#6189↑0.53↑8.3 years
"Whenever you cast a creature spell with power 4, 5, or 6, this enchantment deals 4 damage to any target."
Triskelion80%
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"This creature enters with three +1/+1 counters on it."
+1 more matching line
Jeska, Warrior Adept80%
$3.54↑#19988↑0.00↓24.4 years↑
": this card deals 1 damage to any target."
: this card deals 1 damage to any target."