Frontier Siege 
Enchantment
$0.19 #3351 0.35 11.7 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%
$0.42↑#5929↓0.18↓7.0 years↓
"Whenever this creature or another creature you control enters, this creature fights up to one target creature you don't control."
Gruul Ragebeast88%
$0.44↑#7679↓0.15↓13.7 years↑
"Whenever this creature or another creature you control enters, that creature fights target creature an opponent controls."
Waterkin Shaman74%
$0.10↓#31011↓0.00↓7.3 years↓
"Whenever a creature you control with flying enters, this creature gets +1/+1 until end of turn."
Boxing Ring74%
$0.57↑#9650↓0.274.5 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%
$0.08↓#20741↓0.00↓8.0 years↓
"When this creature enters, you may have it fight target creature you don't control."
Somberwald Stag72%
$0.06↓#24505↓0.06↓10.2 years↓
"When this creature enters, you may have it fight target creature you don't control."
Pheres-Band Brawler72%
$0.07↓#29079↓0.10↓6.7 years↓
"When this creature enters, it fights up to one target creature you don't control."
Atzocan Archer72%
$0.22↑#21295↓0.20↓9.1 years↓
"When this creature enters, you may have it fight another target creature."
Apex Altisaur72%
$8.95↑#1500↑0.59↑7.2 years↓
"Whenever this creature is dealt damage, it fights up to one target creature you don't control."
Outpost Siege71%
$0.24↑#2426↑0.17↓11.7 years
"As this enchantment enters, choose Khans or Dragons."
+1 more matching line
Ulvenwald Tracker71%
$5.72↑#29730.24↓14.5 years↑
"
, 
: Target creature you control fights another target creature."
, : Target creature you control fights another target creature."
Bridgeworks Battle // Tanglespan Bridgeworks70%
$1.28↑#670↑0.15↓2.3 years↓
": Add ."
: Add ."
Contested Cliffs70%
$0.76↑#10288↓0.11↓24.0 years↑
": Add 
."
: Add ."+1 more matching line
Kiora, Master of the Depths70%
$2.91↑#9068↓0.19↓11.0 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%
$0.28↑#8420↓0.10↓32.0 years↑
": Add ."
: Add ."
Tinder Farm70%
$0.18↓#21881↓0.02↓26.0 years↑
": Add ."
: Add ."