Rivals' Duel 
Sorcery
$0.10 #26959 0.00 18.6 years
Choose two target creatures that share no creature types. Those creatures fight each other. (Each deals damage equal to its power to the other.)
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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.
Blood Feud92%
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"Target creature fights another target creature."
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"Target creature fights another target creature."
Dissension in the Ranks84%
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"Target creature you control fights another target creature."
Pounce78%
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"Target creature you control fights target creature you don't control."
Prey Upon78%
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"Target creature you control fights target creature you don't control."
Smell Fear78%
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"Target creature you control fights up to one target creature you don't control."
Prizefight75%
$0.18↑#3655↑0.18↑4.4 years↓
"Target creature you control fights target creature you don't control."
Go for Blood74%
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"Target creature you control fights target creature you don't control."
Mutiny74%
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"Target creature an opponent controls deals damage equal to its power to another target creature that player controls."
Titanic Brawl73%
$0.13↑#7922↑0.32↑7.6 years↓
"Target creature you control fights target creature you don't control."
Savage Punch73%
$0.07↓#13149↑0.50↑11.9 years↓
"Target creature you control fights target creature you don't control."
The Curse of Fenric73%
$0.22↑#18216↑0.12↑2.9 years↓
"Target Mutant fights another target creature named Fenric."
Duel for Dominance73%
$0.18↑#13937↑0.33↑4.9 years↓
"Choose target creature you control and target creature you don't control. If you control three or more creatures with different powers, put a +1/+1 counter on the chosen creature you control. Then the chosen creatures fight each other."
Malamet Battle Glyph73%
$0.23↑#15062↑0.29↑2.8 years↓
"Choose target creature you control and target creature you don't control. If the creature you control entered this turn, put a +1/+1 counter on it. Then those creatures fight each other."
Troll Negotiations72%
$0.20↑#249970.000.1 years↓
"Put two +1/+1 counters on target creature you control. Then it fights target creature an opponent controls."
Hunt the Weak72%
$0.02↓#17403↑0.0613.1 years↓
"Put a +1/+1 counter on target creature you control. Then that creature fights target creature you don't control."
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"Target creature you control fights target creature you don't control."
Kapow!72%
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"Put a +1/+1 counter on target creature you control. It fights target creature an opponent controls."
Wild Instincts72%
$0.06↓#271110.0011.1 years↓
"Target creature you control gets +2/+2 until end of turn. It fights target creature an opponent controls."