Delvefall
Jegantha, the Wellspring

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?

Timeless Lotus
Timeless Lotus 98%
$2.60#2196
"{T}: Add {W}{U}{B}{R}{G}."
Crystal Quarry
Crystal Quarry 90%
$1.59#6038
"{5}, {T}: Add {W}{U}{B}{R}{G}."
Jenson Carthalion, Druid Exile
Jenson Carthalion, Druid Exile 90%
$0.79#7693
"{5}, {T}: Add {W}{U}{B}{R}{G}."
Lutri, the Spellchaser
Lutri, the Spellchaser 89%
$0.68#12623
"Companion — Each nonland card in your starting deck has a different name."
Codie, Vociferous Codex
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
Umori, the Collector 88%
$0.26#11613
"Companion — Each nonland card in your starting deck shares a card type."
Gyruda, Doom of Depths
Gyruda, Doom of Depths 84%
$0.51#4336
"Companion — Your starting deck contains only cards with even mana values."
Zirda, the Dawnwaker
Zirda, the Dawnwaker 83%
$2.00#3281
"Companion — Each permanent card in your starting deck has an activated ability."
Channel the Suns
Channel the Suns 82%
$0.61#17029
"Add {W}{U}{B}{R}{G}."