Draft and sealed force you to work with whatever colors you open, teaching flexibility
The primary back-up would be Tuvasa the Sunlit, a once-per-turn enchantress that grows with your board state
Use Kefka, Court Mage and Emet-Selch, Unsundered to get big finishers like Summon: Bahamut, Sphinx of the Final Word, Summon: Primal Odin, and Ovika, Enigma Goliath in the graveyard, and then use Zombify to cheat one of them into play for just four mana
And I'm excluding Juzam Djinn for being terrible in Commander
I, II Until your next turn, creatures you control gain ": Add one mana of any color." III Put a +1/+1 counter on each creature you control
The utility of being able to use this as a (sorcery-speed) pump spell in addition to the fight mechanic was extremely valuable to those decks at the time, which were full of cards like Questing Beast, Lovestruck Beast, Gemrazer, Kazandu Mammoth and other beefy creatures that benefited heavily from fighting