Darksteel Reactor {4}
Artifact
Indestructible (Effects that say "destroy" don't destroy this artifact.)
At the beginning of your upkeep, you may put a charge counter on this artifact.
When this artifact has twenty or more charge counters on it, you win the game.
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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.
Aether Vial 100%
$3.48#5863
"At the beginning of your upkeep, you may put a charge counter on this artifact."
Golden Urn 100%
$0.24#18932
"At the beginning of your upkeep, you may put a charge counter on this artifact."
+1 more matching line
Shrine of Piercing Vision 93%
$0.13#23983
"At the beginning of your upkeep and whenever you cast a blue spell, put a charge counter on this artifact."
Shrine of Burning Rage 92%
$0.18#20348
"At the beginning of your upkeep and whenever you cast a red spell, put a charge counter on this artifact."
Shrine of Limitless Power 92%
$0.14#26505
"At the beginning of your upkeep and whenever you cast a black spell, put a charge counter on this artifact."
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
Shrine of Loyal Legions 89%
$0.23#17117
"At the beginning of your upkeep and whenever you cast a white spell, put a charge counter on this artifact."
Vedalken Infuser 82%
$0.11#22266
"At the beginning of your upkeep, you may put a charge counter on target artifact."