Ancient Animus 
Instant
$0.22 #4919 0.37 8.4 years
Put a +1/+1 counter on target creature you control if it's legendary. Then it fights target creature an opponent controls. (Each deals damage equal to its power to the other.)
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Cards similar to Ancient Animus 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.
Kapow!94%
$0.10↓#10894↓0.391.0 years↓
"Put a +1/+1 counter on target creature you control. It fights target creature an opponent controls."
Troll Negotiations94%
$0.20↓#24997↓0.00↓0.1 years↓
"Put two +1/+1 counters on target creature you control. Then it fights target creature an opponent controls."
Hunt the Weak94%
$0.02↓#17403↓0.06↓13.1 years↑
"Put a +1/+1 counter on target creature you control. Then that creature fights target creature you don't control."
Pounce90%
$0.17↓#13147↓0.22↓8.9 years
"Target creature you control fights target creature you don't control."
Prey Upon90%
$0.09↓#6414↓0.25↓14.9 years↑
"Target creature you control fights target creature you don't control."
Smell Fear90%
$0.33↑#40880.13↓5.2 years↓
"Target creature you control fights up to one target creature you don't control."
Mutant's Prey90%
$0.15↓#12315↓0.23↓13.3 years↑
"Target creature you control with a +1/+1 counter on it fights target creature an opponent controls."
Pit Fight89%
$0.16↓#11114↓0.3113.6 years↑
"Target creature you control fights another target creature."
Duel for Dominance89%
$0.18↓#13937↓0.334.9 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 Glyph89%
$0.23↑#15062↓0.292.8 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."
Struggle for Skemfar88%
$0.15↓#20442↓0.00↓5.6 years↓
"Put a +1/+1 counter on target creature you control. Then that creature fights up to one target creature you don't control."
Wild Instincts88%
$0.06↓#27111↓0.00↓11.1 years↑
"Target creature you control gets +2/+2 until end of turn. It fights target creature an opponent controls."
Swift Kick88%
$0.04↓#25602↓0.00↓11.9 years↑
"Target creature you control gets +1/+0 until end of turn. It fights target creature you don't control."
Ruthless Predation88%
$0.14↓#19086↓0.00↓3.6 years↓
"Target creature you control gets +1/+2 until end of turn. It fights target creature you don't control."
Epic Confrontation88%
$0.04↓#15946↓0.00↓11.4 years↑
"Target creature you control gets +1/+2 until end of turn. It fights target creature you don't control."
Savage Smash88%
$0.14↓#16101↓0.427.6 years
"Target creature you control gets +2/+2 until end of turn. It fights target creature you don't control."
Prizefight87%
$0.18↓#3655↑0.18↓4.4 years↓
"Target creature you control fights target creature you don't control."
Savage Stomp86%
$0.23↑#6158↓0.80↑8.9 years
"Put a +1/+1 counter on target creature you control. Then that creature fights target creature you don't control."
Chelonian Tackle86%
$0.19↓#18498↓0.00↓0.4 years↓
"Target creature you control gets +0/+10 until end of turn. Then it fights up to one target creature an opponent controls."
Go for Blood85%
$0.10↓#13763↓0.25↓6.4 years↓
"Target creature you control fights target creature you don't control."