Rivals' Duel 
Sorcery
$0.11 #27144 0.16 18.7 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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Cards similar to Rivals' Duel 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.
Clash of Titans92%
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"Target creature fights another target creature."
Blood Feud92%
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"Target creature fights another target creature."
Dissension in the Ranks84%
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"Target blocking creature fights another target blocking creature."
Pit Fight79%
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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%
$0.06↓#6529↑0.00↓15.1 years↓
"Target creature you control fights target creature you don't control."
Smell Fear78%
$0.28↑#4167↑0.05↓5.3 years↓
"Target creature you control fights up to one target creature you don't control."
Prizefight75%
$0.20↑#3684↑0.154.5 years↓
"Target creature you control fights target creature you don't control."
Go for Blood74%
$0.11#13841↑0.47↑6.5 years↓
"Target creature you control fights target creature you don't control."
Savage Punch73%
$0.11#13315↑0.06↓12.1 years↓
"Target creature you control fights target creature you don't control."
Titanic Brawl73%
$0.12↑#7970↑0.06↓7.7 years↓
"Target creature you control fights target creature you don't control."
The Curse of Fenric73%
$0.24↑#18647↑0.00↓3.0 years↓
"Target Mutant fights another target creature named Fenric."
Malamet Battle Glyph73%
$0.22↑#15439↑0.222.9 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."
Mutiny73%
$0.08↓#15936↑0.168.8 years↓
"Target creature an opponent controls deals damage equal to its power to another target creature that player controls."
Troll Negotiations72%
$0.10↓#221740.070.2 years↓
"Put two +1/+1 counters on target creature you control. Then it fights target creature an opponent controls."
Hunt the Weak72%
$0.05↓#17609↑0.1913.3 years↓
"Put a +1/+1 counter on target creature you control. Then that creature fights target creature you don't control."
Khalni Ambush // Khalni Territory72%
$0.48↑#1749↑0.116.1 years↓
"Target creature you control fights target creature you don't control."
Duel for Dominance72%
$0.20↑#13967↑0.27↑5.1 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."
Kapow!72%
$0.17↑#10771↑0.221.1 years↓
"Put a +1/+1 counter on target creature you control. It fights target creature an opponent controls."
Wild Instincts72%
$0.05↓#273590.06↓11.3 years↓
"Target creature you control gets +2/+2 until end of turn. It fights target creature an opponent controls."