Iron Mastiff 
Artifact Creature — Dog
$0.33 #6827 0.00 4.2 years
Whenever this creature attacks, roll a d20 for each player being attacked and ignore all but the highest roll.
1—9 | This creature deals damage equal to its power to you.
10—19 | This creature deals damage equal to its power to defending player.
20 | This creature deals damage equal to its power to each opponent.
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Cards similar to Iron Mastiff 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.
Sylvan Shepherd84%
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"At the beginning of each end step, if a card left your graveyard this turn, this card deals damage equal to its power to each opponent."
+1 more matching line
Chaos Channeler79%
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"Whenever this creature attacks, roll a d20."
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"When this creature dies, it deals damage equal to its power to each opponent."
Farideh's Fireball75%
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"this card deals 2 damage to each opponent."
+1 more matching line
Lightfoot Rogue75%
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"Whenever this creature attacks, roll a d20."
Hoarding Ogre74%
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"Whenever this creature attacks, roll a d20."
Meglonoth74%
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"Whenever this creature blocks a creature, this creature deals damage to that creature's controller equal to this creature's power."
Sif's Spearmaster74%
$0.28↓#25532↓0.000.2 years↓
"
: This creature deals damage equal to its power to target opponent."
: This creature deals damage equal to its power to target opponent."
Sizzle74%
$0.21↓#15625↓0.16↑26.9 years↑
"this card deals 3 damage to each opponent."
Breath of Malfegor74%
$0.17↓#13677↓0.0017.3 years↑
"this card deals 5 damage to each opponent."
Flaming Tyrannosaurus74%
$8.50↑#3171↑0.46↑2.9 years↓
"When this creature dies, it deals damage equal to its power to each opponent."
Vincent, Vengeful Atoner72%
$0.34↑#4174↑0.37↑1.2 years↓
"Whenever this card deals combat damage to an opponent, it deals that much damage to each other opponent if this card's power is 7 or greater."
Stampede Surfer72%
$0.38↑#18834↓0.40↑2.5 years↓
"Whenever this creature attacks, for each opponent, you create a 2/2 green Boar creature token that's tapped and attacking that opponent."
Origin of Thor72%
$0.30↓#20810↓0.000.2 years↓
"Target creature you control deals damage equal to its power to each opponent."
Mega Flare72%
$0.93↑#17872↓0.000.8 years↓
"For each opponent, choose up to one target creature that player controls. this card deals damage equal to the greatest power among creatures you control to each of the chosen creatures."
Syphon Soul72%
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"this card deals 2 damage to each other player. You gain life equal to the damage dealt this way."
Feral Ghoul70%
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"When this creature dies, each opponent gets a number of rad counters equal to its power."
Eshki, Temur's Roar70%
$0.61↑#5378↑0.48↑1.4 years↓
"Whenever you cast a creature spell, put a +1/+1 counter on this card. If that spell's power is 4 or greater, draw a card. If that spell's power is 6 or greater, this card deals damage equal to this card's power to each opponent."
Ghost-Spider, Gwen Stacy70%
$10.71↑#11175↓0.41↑0.9 years↓
"Whenever this card attacks, she deals X damage to defending player, where X is the number of attacking creatures."