Omnath, Locus of All {W}{U}{B/P}{R}{G}
Legendary Creature — Phyrexian Elemental
If you would lose unspent mana, that mana becomes black instead.
At the beginning of your first main phase, look at the top card of your library. You may reveal that card if it has three or more colored mana symbols in its mana cost. If you do, add three mana in any combination of its colors and put it into your hand. If you don't reveal it, put it into 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.
Kruphix, God of Horizons 95%
$4.03#4617
"If you would lose unspent mana, that mana becomes colorless instead."
Ozai, the Phoenix King 84%
$3.65#4107
"If you would lose unspent mana, that mana becomes red instead."