Frontier Siege 
Enchantment
$0.19 #3307 0.19 11.6 years
As this enchantment enters, choose Khans or Dragons.
• Khans — At the beginning of each of your main phases, add .
.• Dragons — Whenever a creature you control with flying enters, you may have it fight target creature you don't control.
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Cards similar to Frontier Siege 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.
Thorn Mammoth88%
$0.36↑#5898↓0.266.9 years↓
"Whenever this creature or another creature you control enters, this creature fights up to one target creature you don't control."
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"Whenever this creature or another creature you control enters, that creature fights target creature an opponent controls."
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"Whenever a creature you control with flying enters, this creature gets +1/+1 until end of turn."
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$0.49↑#9666↓0.58↑4.4 years↓
"Whenever a creature you control enters, it fights up to one target creature you don't control with the same mana value."
Affectionate Indrik72%
$0.07↓#20619↓0.00↓7.9 years↓
"When this creature enters, you may have it fight target creature you don't control."
Somberwald Stag72%
$0.07↓#24209↓0.33↑10.1 years↓
"When this creature enters, you may have it fight target creature you don't control."
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$0.04↓#28861↓0.256.6 years↓
"When this creature enters, it fights up to one target creature you don't control."
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$0.21↑#21183↓0.00↓8.9 years↓
"When this creature enters, you may have it fight another target creature."
Outpost Siege72%
$0.25↑#2361↑0.1311.6 years
"As this enchantment enters, choose Khans or Dragons."
+1 more matching line
Apex Altisaur72%
$8.48↑#1494↑0.46↑7.0 years↓
"Whenever this creature is dealt damage, it fights up to one target creature you don't control."
Ulvenwald Tracker71%
$5.60↑#29640.2214.3 years↑
"
, 
: Target creature you control fights another target creature."
, : Target creature you control fights another target creature."
Bridgeworks Battle // Tanglespan Bridgeworks70%
$1.56↑#678↑0.09↓2.2 years↓
": Add ."
: Add ."
Kiora, Master of the Depths70%
$2.17↑#9066↓0.80↑10.9 years
"−8: You get an emblem with "Whenever a creature you control enters, you may have it fight target creature." Then create three 8/8 blue Octopus creature tokens."
Havenwood Battleground70%
$0.29↑#8439↓0.03↓31.8 years↑
": Add ."
: Add ."
Tinder Farm70%
$0.18↓#21651↓0.06↓25.9 years↑
": Add ."
: Add ."