Outmuscle 
Sorcery
$0.07 #16163 0.11 7.0 years
Put a +1/+1 counter on target creature you control, then it fights target creature you don't control. (Each deals damage equal to its power to the other.)
Adamant — If at least three green mana was spent to cast this spell, the creature you control gains indestructible until end of turn.
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Cards similar to Outmuscle 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.
Hunt the Weak91%
$0.05↓#176090.1913.3 years↑
"Put a +1/+1 counter on target creature you control. Then that creature fights target creature you don't control."
Kapow!91%
$0.17↑#10771↑0.22↑1.1 years↓
"Put a +1/+1 counter on target creature you control. It fights target creature an opponent controls."
Troll Negotiations90%
$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."
Chelonian Tackle86%
$0.14↑#180060.120.5 years↓
"Target creature you control gets +0/+10 until end of turn. Then it fights up to one target creature an opponent controls."
Malamet Battle Glyph86%
$0.22↑#154390.22↑2.9 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."
Pounce86%
$0.20↑#133780.139.1 years↑
"Target creature you control fights target creature you don't control."
Prey Upon86%
$0.06↓#6529↑0.00↓15.1 years↑
"Target creature you control fights target creature you don't control."
Smell Fear85%
$0.28↑#4167↑0.055.3 years↓
"Target creature you control fights up to one target creature you don't control."
Mutant's Prey84%
$0.23↑#12455↑0.1413.5 years↑
"Target creature you control with a +1/+1 counter on it fights target creature an opponent controls."
Vigorbloom Charm84%
$0.29↑#135060.24↑0.0 years↓
"• Put a +1/+1 counter on target creature you control. Then it fights target creature an opponent controls."
+1 more matching line
Pit Fight84%
$0.16↑#11314↑0.00↓13.7 years↑
"Target creature you control fights another target creature."
Wild Instincts84%
$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 Predation84%
$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 Confrontation84%
$0.06↓#162300.0711.6 years↑
"Target creature you control gets +1/+2 until end of turn. It fights target creature you don't control."
Savage Smash84%
$0.11↑#164040.067.7 years
"Target creature you control gets +2/+2 until end of turn. It fights target creature you don't control."
Savage Stomp84%
$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."
Struggle for Skemfar83%
$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."
Ancient Animus82%
$0.23↑#4973↑0.138.5 years↑
"Put a +1/+1 counter on target creature you control if it's legendary. Then it fights target creature an opponent controls."
Swift Kick82%
$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."
Duel for Dominance82%
$0.20↑#139670.27↑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."