Iron Mastiff {4}
Artifact Creature — Dog
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 that do something similar 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.
Streetwise Negotiator 85%
$0.15#23601
"This creature assigns combat damage equal to its toughness rather than its power."
Jagged Poppet 84%
$0.31#21845
"Whenever this creature deals combat damage to a player, if you have no cards in hand, that player discards cards equal to the damage."
Gleeful Arsonist 82%
$5.66#2701
"Whenever an opponent casts a noncreature spell, this creature deals damage equal to its power to that player."
Summon: Bahamut 82%
$21.08#1398
"This creature deals damage equal to the total mana value of other permanents you control to each opponent."
Ikra Shidiqi, the Usurper 81%
$0.36#3733
"Whenever a creature you control deals combat damage to a player, you gain life equal to that creature's toughness."
+1 more matching line
Beastie Beatdown 81%
$0.19#14182
"The creature you control deals damage equal to its power to the creature an opponent controls."
Hydra Omnivore 81%
$0.54#3943
"Whenever this creature deals combat damage to an opponent, it deals that much damage to each other opponent."
Grenzo's Ruffians 81%
$0.21#20720
"Whenever this creature deals combat damage to an opponent, it deals that much damage to each other opponent."
Cyclops Gladiator 80%
$0.17#23913
"Whenever this creature attacks, you may have it deal damage equal to its power to target creature defending player controls. If you do, that creature deals damage equal to its power to this creature."