So, I was sitting here mulling about Eternal and the fun cards I enjoy. I love building 5 color decks and have done so with some very wild builds but I also enjoy some of the multicolor cards that have great value. Slowly the idea for this deck formed. I haven't tested it at all in ranked or casual. But I did run a master level gauntlet with it without false starts. So it might be worth playing for fun in gauntlets or casual. The crests are essential for fixing as they help you control your early draw. A careful mulligan strategy combined with a crest or two can fix your mana for the game.
Double Justice is probably the most important and then Double Fire. Waystones are probably a better choice than sigils for basic power since there is no downside to them and occasionally (very rarely I think) they might give you a benefit.