Stand Together is in a weird place for the CoE event — it's great against basically every deck (blanking removal spells and winning massive combats), but it's also in by far the worst two colors. The aggro decks destroy you for bad mana in this event, so I think the only viable way to get access to this card is to splash Time just for it, then combine Justice's serviceable but unexciting spells with either Fire, Primal, or Shadow. Primal's stun cards fit the same plan as the Justice tempo cards, so I went with that.
This went 7-2 but felt clunky. Eilyn's Choice wasn't great and it probably needs more time sources. I don't think this build can ever get amazing because it will always have the chance of garbage hands full of Dazes and Finest Hours, but it's destructive when you draw Stand Together + two more multi-target buffs or stuns to follow it. If you have another build that puts Stand Together to better use, let me know!
This deck feels unbeatable when you get the perfect draw, and then next game you draw a pile of draft rejects, get two cliff porters with your first spells, and wonder what you're doing with your life.