Enigma Eidolon 

Creature — Spirit
{U}, Sacrifice this creature: Target player mills three cards.
Whenever you cast a multicolored spell, you may return this card from your graveyard to your hand.
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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.
Entropic Eidolon 100%
$0.13#28190
"Whenever you cast a multicolored spell, you may return this card from your graveyard to your hand."
Verdant Eidolon 100%
$0.14#23548
"Whenever you cast a multicolored spell, you may return this card from your graveyard to your hand."
Sandstorm Eidolon 100%
$0.18#28468
"Whenever you cast a multicolored spell, you may return this card from your graveyard to your hand."