Chaos Dragon {1}{R}{R}
Creature — Dragon
Flying, haste
This creature attacks each combat if able.
At the beginning of combat on your turn, each player rolls a d20. If one or more opponents had the highest result, this creature can't attack those players or planeswalkers they control this combat.
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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.
Champions of Minas Tirith 85%
$0.32#5273
"At the beginning of combat on each opponent's turn, if you're the monarch, that opponent may pay {X}, where X is the number of cards in their hand. If they don't, they can't attack you this combat."
Web of Inertia 81%
$0.75#11836
"At the beginning of combat on each opponent's turn, that player may exile a card from their graveyard. If the player doesn't, creatures they control can't attack you this turn."
Impetuous Sunchaser 100%
$0.19#22727
"This creature attacks each combat if able."
+1 more matching line
Flamewake Phoenix 100%
$0.22#10110
"This creature attacks each combat if able."
+1 more matching line
Flameborn Hellion 100%
$0.04#30161
"This creature attacks each combat if able."
+1 more matching line
Ashen Monstrosity 100%
$0.23#28497
"This creature attacks each combat if able."
+1 more matching line
Daring Fiendbonder 100%
$0.91#9222
"This creature attacks each combat if able."
+1 more matching line
Weary Prisoner // Wrathful Jailbreaker 100%
$0.22#21401
"This creature attacks each combat if able."