the idea is to ramp up a good mana base to be able to play those powerful multicolour cards that are too cool to only keep in boxes for years.
At the beginning Inquisitive Puppet and Voltaic Servant should keep early life loss at a tolerable level. Traxos, Scourge of Kroog + Voltaic Servant
stop any threats on the ground and might as well generate some pressure from turn 4/5 on.
Ilysian Caryatid, Song of Freyalise (maybe combined with Harvest Season) and Cultivate help put out a turn 4 Bringer of the Blue Dawn, Chromanticore (thinking about running it twice) or Omnath, Locus of Creation. Early Darigaaz Reincarnated also works a charm. and with a well timed Plasm Capture it might as well be Progenitus and then just see what the opponent has to respond.
Scion of Draco to spice it up even further and keep some multicolour creatures save. should be playable for 2 or 4 mana at that point.
Tatyova, Benthic Druid + Omnath, Locus of Creation work nicely with fetchlands and Fabled Passage and also Cultivate.
For some extra draw, or just to pull an opponent's removal, i played Thunderous Snapper, but it's not legendary. Same problem with Woodland Wanderer, even though it's pretty much a Traxos, Scourge of Kroog with vigilance, since i always play it with 4 colours. Have to think about that a bit more and play some trial matches.
I'm also not sure about Kethis, the Hidden Hand. i just had it lying around and it looks fun. But it doesn't have the 4 power that Ilysian Caryatid needs to work perfectly. Surrak Dragonclaw is in right now, but i guess it's redundant, since the larger creatures have trample anyway and the flash and can't be countered banter is maybe not worth keeping 5 mana open. well... thinking about putting Thicket Elemental back in instead, cause chances aren't that bad for spawning some crazy creature with it.
Kamahl's Druidic Vow also look pretty interesting. and i also got two excess Tatyova, Benthic Druids, but i guess twice is enough.
Maybe someone has an idea how to streamline it a bit. I think i want to keep it pretty surprising over 5 manavalue, but below that there might be some way to be more efficient. Or maybe get some (permanent) removals in somehow. Or at least some 2/3 mana legendary creatures.