Jegantha, the Wellspring {4}{R/G}
Legendary Creature — Elemental Elk
Companion — No card in your starting deck has more than one of the same mana symbol in its mana cost. (If this card is your chosen companion, you may put it into your hand from outside the game for {3} as a sorcery.)
{T}: Add {W}{U}{B}{R}{G}. This mana can't be spent to pay generic mana costs.
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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.
Lutri, the Spellchaser 89%
$0.68#12623
"Companion — Each nonland card in your starting deck has a different name."
Codie, Vociferous Codex 89%
$0.31#11474
"{4}, {T}: Add {W}{U}{B}{R}{G}. When you next cast a spell this turn, exile cards from the top of your library until you exile an instant or sorcery card with lesser mana value. Until end of turn, you may cast that card without paying its mana cost. Put each other card exiled this way on the bottom of your library in a random order."
Umori, the Collector 88%
$0.26#11613
"Companion — Each nonland card in your starting deck shares a card type."
Gyruda, Doom of Depths 84%
$0.51#4336
"Companion — Your starting deck contains only cards with even mana values."
Zirda, the Dawnwaker 83%
$2.00#3281
"Companion — Each permanent card in your starting deck has an activated ability."