Spark Elemental 
Creature — Elemental
$0.27 #19653 0.00 22.4 years
Trample, haste (This creature can deal excess combat damage to the player or planeswalker it's attacking. This creature can attack and 
as soon as it comes under your control.)
as soon as it comes under your control.)At the beginning of the end step, sacrifice this creature.
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Cards similar to Spark Elemental 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.
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"At the beginning of the end step, sacrifice this creature."
+1 more matching line
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"At the beginning of the end step, sacrifice this creature."
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"At the beginning of the end step, sacrifice this creature."
Spark Trooper93%
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"At the beginning of the end step, sacrifice this creature."
Blistering Firecat92%
$7.16↑#179200.25↑24.0 years↑
"At the beginning of the end step, sacrifice this creature."
+1 more matching line
Yavimaya Ants90%
$0.27#28900↓0.0530.4 years↑
"Trample, haste"
+1 more matching line
Blitz Hellion88%
$0.32↑#24625↓0.12↑17.5 years↓
"Trample, haste"
Lightning Serpent87%
$5.07↑#200470.0620.2 years↓
"At the beginning of the end step, sacrifice this creature."
+1 more matching line
Frostbite Pyromental87%
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"At the beginning of the end step, sacrifice this creature."
+1 more matching line
Putrefax86%
$0.34↑#157871.06↑16.1 years↓
"At the beginning of the end step, sacrifice this creature."
+1 more matching line
Lightning Skelemental86%
$0.36↑#10542↑0.44↑7.4 years↓
"At the beginning of the end step, sacrifice this creature."
+1 more matching line
Impetuous Devils84%
$0.23↓#161410.0610.2 years↓
"At the beginning of the end step, sacrifice this creature."
+1 more matching line
Hellspark Elemental84%
$0.12↓#196660.0017.7 years↓
"At the beginning of the end step, sacrifice this creature."
+1 more matching line
Viashino Sandsprinter84%
$0.17↓#191140.25↑7.4 years↓
"Trample, haste"
+1 more matching line
Skizzik83%
$0.16↓#219350.0026.0 years↑
"At the beginning of the end step, if this creature wasn't kicked, sacrifice it."
+1 more matching line
Hell's Thunder82%
$0.31↑#203630.0018.0 years↓
"At the beginning of the end step, sacrifice this creature."
Shatterskull Charger82%
$0.06↓#182430.006.1 years↓
"Trample, haste"
Lightning Shrieker82%
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"Flying, trample, haste"
Ichorid81%
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"At the beginning of the end step, sacrifice this creature."
Runaway Carriage78%
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"Trample"