Agatha's Soul Cauldron 
Legendary Artifact
You may spend mana as though it were mana of any color to activate abilities of creatures you control.
Creatures you control with +1/+1 counters on them have all activated abilities of all creature cards exiled with Agatha's Soul Cauldron.
{T}: Exile target card from a graveyard. When a creature card is exiled this way, put a +1/+1 counter on target creature you control.
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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.
The Ooze 88%
$4.03#5080
"{T}: Exile target card from a graveyard. Create a Mutagen token."
+1 more matching line
Nathan Drake, Treasure Hunter 85%
$4.72#14996
"You may spend mana as though it were mana of any color to cast spells you don't own or to activate abilities of permanents you control but don't own."