Tail Swipe 
Instant
$0.16 #4181 0.19 4.0 years
Choose target creature you control and target creature you don't control. If you cast this spell during your main phase, the creature you control gets +1/+1 until end of turn. Then those creatures fight each other. (Each deals damage equal to its power to the other.)
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"Target creature you control fights another target creature."
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"Target creature you control gets +0/+10 until end of turn. Then it fights up to one target creature an opponent controls."
Primal Might86%
$0.18↑#38970.146.2 years↑
"Target creature you control gets +X/+X until end of turn. Then it fights up to one target creature you don't control."
Troll Negotiations85%
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"Put two +1/+1 counters on target creature you control. Then it fights target creature an opponent controls."
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"Put a +1/+1 counter on target creature you control. Then that creature fights target creature you don't control."
Bridgeworks Battle // Tanglespan Bridgeworks84%
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"Target creature you control gets +2/+2 until end of turn. It fights up to one target creature you don't control."
Prizefight84%
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"Target creature you control fights target creature you don't control."
Kapow!84%
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"Put a +1/+1 counter on target creature you control. It fights target creature an opponent controls."
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"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."
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"Target creature you control fights target creature you don't control."
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"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."
Titanic Brawl82%
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"Target creature you control fights target creature you don't control."