So far, all I know is I'd like to have these five creatures in the deck. I don't know how to make five color decks work otherwise...
4 {esper stormblade}
4 {grixis grimblade}
4 {bant sureblade}
4 {nayna hushblade}
4 {jund hackblade}
Would the cascade mechanic help?
5 color aggro is pretty hard to pull off because fixing your mana base to hit all your colors consistently usually slows down a deck. But I like the sound of cascade, at least {Bloodbraid Elf}
{call of the kindred} might help