Reservoir Walker 
Artifact Creature — Construct
$0.08 #23551 0.25 9.6 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%
$0.08#204500.219.9 years
"When this artifact enters, you gain 3 life and get ."
."
Sage of Shaila's Claim94%
$0.14↑#224870.339.9 years
"When this creature enters, you get ."
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Rogue Refiner88%
$0.22↑#11675↑0.08↓9.6 years
"When this creature enters, draw a card and you get ."
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Electrozoa84%
$0.15↑#262320.00↓2.2 years↓
"When this creature enters, you get ."
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Tune the Narrative83%
$0.27↑#5992↑0.212.2 years↓
"Draw a card. You get ."
."
Riparian Tiger82%
$0.08#274000.00↓9.9 years
"When this creature enters, you get ."
."
Solstice Zealot82%
$0.15↑#228320.06↓2.2 years↓
"When this creature enters, you get ."
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Shipwreck Moray82%
$0.08#253210.07↓9.6 years
"When this creature enters, you get ."
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Aetherstream Leopard82%
$0.05↓#269390.12↓9.6 years
"When this creature enters, you get ."
."
Spontaneous Artist82%
$0.13↑#261320.06↓9.9 years
"When this creature enters, you get ."
."
Thriving Skyclaw81%
$0.12↑#210000.00↓2.2 years↓
"When this creature enters, you get ."
."
Aether Theorist81%
$0.13↑#17053↑0.199.9 years
"When this creature enters, you get ."
."
Conduit Goblin81%
$0.11↑#195900.13↓2.2 years↓
"When this creature enters, you get ."
."
Scrapper Champion81%
$0.23↑#233070.169.6 years
"When this creature enters, you get ."
."
Hightide Hermit80%
$0.08#225810.50↑9.9 years
"When this creature enters, you get ."
."
Consulate Surveillance80%
$0.24↑#13263↑0.299.9 years
"When this enchantment enters, you get ."
."
Minister of Inquiries80%
$0.15↑#193950.00↓9.9 years
"When this creature enters, you get ."
."
Tempest Harvester80%
$0.13↑#16126↑0.182.2 years↓
"When this creature enters, you get ."
."
Maulfist Doorbuster80%
$0.08#263350.319.9 years
"When this creature enters, you get ."
."
Whirler Virtuoso80%
$0.24↑#5889↑0.00↓9.9 years
"When this creature enters, you get ."
."