Ancient Animus 
Instant
$0.23 #4973 0.13 8.5 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!93%
$0.17↓#10771↓0.221.1 years↓
"Put a +1/+1 counter on target creature you control. It fights target creature an opponent controls."
Troll Negotiations93%
$0.10↓#22174↓0.070.2 years↓
"Put two +1/+1 counters on target creature you control. Then it fights target creature an opponent controls."
Hunt the Weak93%
$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."
Pounce90%
$0.20↓#13378↓0.139.1 years
"Target creature you control fights target creature you don't control."
Prey Upon90%
$0.06↓#6529↓0.00↓15.1 years↑
"Target creature you control fights target creature you don't control."
Smell Fear90%
$0.28↑#41670.055.3 years↓
"Target creature you control fights up to one target creature you don't control."
Duel for Dominance90%
$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."
Pit Fight88%
$0.16↓#11314↓0.00↓13.7 years↑
"Target creature you control fights another target creature."
Malamet Battle Glyph88%
$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."
Mutant's Prey88%
$0.23#12455↓0.1413.5 years↑
"Target creature you control with a +1/+1 counter on it fights target creature an opponent controls."
Swift Kick88%
$0.04↓#25761↓0.2012.1 years↑
"Target creature you control gets +1/+0 until end of turn. It fights target creature you don't control."
Wild Instincts88%
$0.05↓#27359↓0.0611.3 years↑
"Target creature you control gets +2/+2 until end of turn. It fights target creature an opponent controls."
Ruthless Predation87%
$0.13↓#19498↓0.00↓3.7 years↓
"Target creature you control gets +1/+2 until end of turn. It fights target creature you don't control."
Epic Confrontation87%
$0.06↓#16230↓0.0711.6 years↑
"Target creature you control gets +1/+2 until end of turn. It fights target creature you don't control."
Savage Smash87%
$0.11↓#16404↓0.067.7 years
"Target creature you control gets +2/+2 until end of turn. It fights target creature you don't control."
Hog-Monkey Rampage86%
$0.12↓#18768↓0.25↑0.9 years↓
"Choose target creature you control and target creature an opponent controls. Put a +1/+1 counter on the creature you control if it has power 4 or greater. Then those creatures fight each other."
Struggle for Skemfar86%
$0.15↓#20770↓0.28↑5.7 years↓
"Put a +1/+1 counter on target creature you control. Then that creature fights up to one target creature you don't control."
Savage Stomp86%
$0.23#6210↓0.00↓9.1 years
"Put a +1/+1 counter on target creature you control. Then that creature fights target creature you don't control."
Prizefight86%
$0.20↓#3684↑0.154.5 years↓
"Target creature you control fights target creature you don't control."
Chelonian Tackle84%
$0.14↓#18006↓0.120.5 years↓
"Target creature you control gets +0/+10 until end of turn. Then it fights up to one target creature an opponent controls."