Glistening Sphere {3}
Artifact
This artifact enters tapped.
When this artifact enters, proliferate.
{T}: Add one mana of any color.
Corrupted — {T}: Add three mana of any one color. Activate only if an opponent has three or more poison counters.
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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.
Sceptre of Eternal Glory 100%
$19.26#2295
"{T}: Add three mana of any one color. Activate only if you control three or more lands with the same name."
+1 more matching line
Somberwald Sage 100%
$0.55#2566
"{T}: Add three mana of any one color. Spend this mana only to cast creature spells."
Pyramid of the Pantheon 100%
$0.41#13112
"{T}: Add three mana of any one color. Activate only if there are three or more brick counters on this artifact."
+1 more matching line
Rootcoil Creeper 99%
$0.23#9853
"{T}: Add two mana of any one color. Spend this mana only to cast spells from your graveyard."
+1 more matching line
Shang-Chi, Master of Kung Fu 99%
$12.44#11012
"{T}: Add two mana of any one color. Spend this mana only to activate abilities of creature sources."
Overgrown Zealot 99%
$0.21#6825
"{T}: Add two mana of any one color. Spend this mana only to turn permanents face up."
+1 more matching line
Intrepid Stablemaster 98%
$0.25#10183
"{T}: Add two mana of any one color. Spend this mana only to cast Mount or Vehicle spells."
Vedalken Engineer 98%
$0.34#5995
"{T}: Add two mana of any one color. Spend this mana only to cast artifact spells or activate abilities of artifacts."
Weaver of Blossoms // Blossom-Clad Werewolf 98%
$0.27#9789
"{T}: Add two mana of any one color."
+1 more matching line
Mona Lisa, Science Geek 80%
$0.30#7161
"{T}: Add X mana of any one color, where X is this card's power."