Spark Trooper 
Creature — Elemental Soldier
$0.17 #19010 0.40 13.6 years
Trample, lifelink, haste
At the beginning of the end step, sacrifice this creature.
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Cards similar to Spark Trooper 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.
Ball Lightning98%
$0.36↑#8725↑0.06↓32.1 years↑
"At the beginning of the end step, sacrifice this creature."
Arc Runner98%
$0.12↓#166730.00↓16.1 years↑
"At the beginning of the end step, sacrifice this creature."
Groundbreaker88%
$1.34↑#160060.06↓19.6 years↑
"Trample, haste"
+1 more matching line
Blistering Firecat87%
$6.92↑#177060.3323.9 years↑
"Trample, haste"
+1 more matching line
Skizzik86%
$0.17#216600.21↓25.9 years↑
"Trample, haste"
+1 more matching line
Yavimaya Ants86%
$0.22↑#28550↓0.06↓30.2 years↑
"Trample, haste"
+1 more matching line
Ichorid86%
$0.61↑#22976↓0.00↓24.6 years↑
"At the beginning of the end step, sacrifice this creature."
Hell's Thunder85%
$0.26↑#201890.21↓17.9 years↑
"At the beginning of the end step, sacrifice this creature."
Fleetfoot Dancer84%
$0.20↑#189190.354.4 years↓
"Trample, lifelink, haste"
Blitz Hellion84%
$0.34↑#24395↓0.17↓17.3 years↑
"Trample, haste"
Lightning Serpent83%
$3.95↑#198450.4720.1 years↑
"Trample, haste"
+1 more matching line
Spark Elemental82%
$0.28↑#194750.29↓22.3 years↑
"Trample, haste"
+1 more matching line
Crumbling Colossus82%
$0.05↓#23785↓0.00↓15.1 years↑
"When this creature attacks, sacrifice it at end of combat."
Putrefax82%
$0.36↑#154340.80↑15.9 years↑
"Trample, haste"
+1 more matching line
Viashino Sandstalker81%
$0.10↓#26009↓0.53↑29.8 years↑
"At the beginning of the end step, return this creature to its owner's hand."
Viashino Cutthroat81%
$0.16↓#29359↓0.4027.6 years↑
"At the beginning of the end step, return this creature to its owner's hand."
Impetuous Devils80%
$0.26↑#160260.00↓10.1 years↓
"Trample, haste"
+1 more matching line
Rakdos Ragemutt79%
$0.07↓#26861↓0.21↓13.9 years
"Lifelink, haste"
Banehound79%
$0.24↑#9451↑0.06↓7.3 years↓
"Lifelink, haste"
Moldering Karok79%
$0.11↓#22972↓0.00↓5.4 years↓
"Trample, lifelink"