Reservoir Walker 
Artifact Creature — Construct
$0.06 #23858 0.00 9.7 years
When this creature enters, you gain 3 life and get 
(three energy counters).
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Cards similar to Reservoir Walker 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.
Woodweaver's Puzzleknot98%
$0.06#205770.28↑10.1 years
"When this artifact enters, you gain 3 life and get ."
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Sage of Shaila's Claim94%
$0.12↑#227000.27↑10.1 years
"When this creature enters, you get ."
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Rogue Refiner88%
$0.22↑#11717↑0.009.7 years
"When this creature enters, draw a card and you get ."
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Electrozoa84%
$0.07↑#266680.002.3 years↓
"When this creature enters, you get ."
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Tune the Narrative83%
$0.26↑#6111↑0.002.3 years↓
"Draw a card. You get ."
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Riparian Tiger82%
$0.09↑#277380.17↑10.1 years
"When this creature enters, you get ."
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Solstice Zealot82%
$0.10↑#233760.052.3 years↓
"When this creature enters, you get ."
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Shipwreck Moray82%
$0.05↓#256590.009.7 years
"When this creature enters, you get ."
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Aetherstream Leopard82%
$0.05↓#272220.11↑9.7 years
"When this creature enters, you get ."
."
Thriving Skyclaw81%
$0.16↑#214330.25↑2.3 years↓
"When this creature enters, you get ."
."
Tempest Harvester81%
$0.16↑#16477↑0.062.3 years↓
"When this creature enters, you get ."
."
Scrapper Champion81%
$0.25↑#237580.069.7 years
"When this creature enters, you get ."
."
Conduit Goblin81%
$0.10↑#200740.12↑2.3 years↓
"When this creature enters, you get ."
."
Hightide Hermit80%
$0.04↓#230170.19↑10.1 years
"When this creature enters, you get ."
."
Consulate Surveillance80%
$0.28↑#13546↑0.15↑10.1 years
"When this enchantment enters, you get ."
."
Voltaic Brawler80%
$0.17↑#282970.0710.1 years
"When this creature enters, you get ."
."
Minister of Inquiries80%
$0.24↑#196290.0010.1 years
"When this creature enters, you get ."
."
Maulfist Doorbuster80%
$0.07↑#266840.13↑10.1 years
"When this creature enters, you get ."
."
Aether Theorist80%
$0.09↑#17313↑0.0010.1 years
"When this creature enters, you get ."
."
Whirler Virtuoso80%
$0.23↑#5985↑0.12↑10.1 years
"When this creature enters, you get ."
."