Churning Reservoir 
Artifact
$0.09 #19621 0.00 3.6 years
At the beginning of your upkeep, put an oil counter on another target nontoken artifact or creature you control.
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Cards similar to Churning Reservoir 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.
The Monumental Facade78%
$0.22↑#13501↑0.10↑3.6 years
"
, Remove an oil counter from this land: Put an oil counter on target artifact or creature you control. Activate only as a sorcery."
Momentum74%
$0.20↑#28491↓0.0027.2 years↑
"At the beginning of your upkeep, you may put a growth counter on this Aura."
Thallid72%
$0.15↑#9206↑0.24↑31.8 years↑
"At the beginning of your upkeep, put a spore counter on this creature."
+1 more matching line
Thallid Shell-Dweller72%
$0.15↑#9557↑0.21↑21.0 years↑
"At the beginning of your upkeep, put a spore counter on this creature."
+1 more matching line
Assemble the Legion70%
$0.31↑#2202↑0.17↑13.6 years↑
"At the beginning of your upkeep, put a muster counter on this enchantment. Then create a 1/1 red and white Soldier creature token with haste for each muster counter on this enchantment."
Rakka Mar70%
$0.20↑#179930.29↑17.6 years↑
"
,
: Create a 3/1 red Elemental creature token with haste."