I ended up with the three-color jellybean himself: Omnath, Locus of the Roil
The primary back-up would be Tuvasa the Sunlit, a once-per-turn enchantress that grows with your board state
In fact, has been a long time since a new card with regenerate was released, leading the mechanic to be effectively replaced with the indestructible ability for some very valid reasons
Lee on 8 Cast Game 1 Lee draws 12 cards on turn two between two Thoughtcasts, two Baubles and three of those weird Thoughtcast creatures
Either they commit excess resources to bypass your defenses, or they just look the other way and attack other players
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