Unnatural Aggression 
Instant
$0.18 #20175 0.00 10.9 years
Devoid (This card has no color.)
Target creature you control fights target creature an opponent controls. If the creature an opponent controls would die this turn, exile it instead.
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Cards similar to Unnatural Aggression expected a card that isn't here?
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Vestige of Emrakul88%
$0.11↓#28743↓0.22↑10.9 years
"Devoid"
Reality Hemorrhage86%
$0.14↓#27662↓0.25↑10.6 years
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Pounce84%
$0.17↓#13147↑0.22↑8.9 years↓
"Target creature you control fights target creature you don't control."
Prey Upon84%
$0.09↓#6414↑0.25↑14.9 years↑
"Target creature you control fights target creature you don't control."
Serpentine Spike84%
$0.12↓#27387↓0.29↑10.9 years
"this card deals 2 damage to target creature, 3 damage to another target creature, and 4 damage to a third target creature. If a creature dealt damage this way would die this turn, exile it instead."
+1 more matching line
Pit Fight84%
$0.16↓#11114↑0.31↑13.6 years↑
"Target creature you control fights another target creature."
Smell Fear84%
$0.33↑#4088↑0.13↑5.2 years↓
"Target creature you control fights up to one target creature you don't control."
Processor Assault83%
$0.11↓#28477↓0.42↑10.9 years
"Devoid"
Stalking Drone83%
$0.04↓#29688↓0.0010.6 years
"Devoid"
Blinding Drone83%
$0.05↓#235380.13↑10.6 years
"Devoid"
Sifter of Skulls82%
$0.73↑#3575↑0.23↑10.6 years
"Devoid"
Call the Scions82%
$0.12↓#12852↑0.18↑10.9 years
"Devoid"
Silent Skimmer82%
$0.04↓#25656↓0.12↑10.9 years
"Devoid"
Maw of Kozilek82%
$0.11↓#29737↓0.50↑10.6 years
"Devoid"
Wild Instincts82%
$0.06↓#27111↓0.0011.1 years
"Target creature you control gets +2/+2 until end of turn. It fights target creature an opponent controls."
Reaver Drone82%
$0.05↓#28375↓0.24↑10.6 years
"Devoid"
Havoc Sower82%
$0.07↓#30942↓0.0010.6 years
"Devoid"
Flaying Tendrils82%
$0.08↓#24535↓0.24↑10.7 years
"Devoid"
Bearer of Silence82%
$0.28↑#225010.39↑10.6 years
"Devoid"
Swift Kick81%
$0.04↓#25602↓0.0011.9 years↑
"Target creature you control gets +1/+0 until end of turn. It fights target creature you don't control."