Shrine of Loyal Legions {2}
Artifact
At the beginning of your upkeep and whenever you cast a white spell, put a charge counter on this artifact.
{3}, {T}, Sacrifice this artifact: Create a 1/1 colorless Phyrexian Myr artifact creature token for each charge counter on this artifact.
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Cards that do something similar 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.
Shrine of Limitless Power 93%
$0.14#26505
"At the beginning of your upkeep and whenever you cast a black spell, put a charge counter on this artifact."
+1 more matching line
Shrine of Piercing Vision 92%
$0.13#23983
"At the beginning of your upkeep and whenever you cast a blue spell, put a charge counter on this artifact."
+1 more matching line
Shrine of Burning Rage 91%
$0.18#20348
"At the beginning of your upkeep and whenever you cast a red spell, put a charge counter on this artifact."
+1 more matching line
Shrine of Boundless Growth 90%
$0.20#24430
"At the beginning of your upkeep and whenever you cast a green spell, put a charge counter on this artifact."
+1 more matching line
Aether Vial 89%
$3.48#5863
"At the beginning of your upkeep, you may put a charge counter on this artifact."
Golden Urn 89%
$0.24#18932
"At the beginning of your upkeep, you may put a charge counter on this artifact."
+1 more matching line
Darksteel Reactor 89%
$0.31#3837
"At the beginning of your upkeep, you may put a charge counter on this artifact."
+1 more matching line
Wickersmith's Tools 81%
$0.21#9025
"{5}, {T}, Sacrifice this artifact: Create X tapped 2/2 colorless Scarecrow artifact creature tokens, where X is the number of charge counters on this artifact."
Myr Incubator 81%
$2.43#15513
"{6}, {T}, Sacrifice this artifact: Search your library for any number of artifact cards, exile them, then create that many 1/1 colorless Myr artifact creature tokens. Then shuffle."