Well the allied colors are easy tribals.

UW spirits
RG werewolves
UB zombies
GW humans
RB vampires.

But what is going on with the enemy colors:
RW: Equipment/artifacts?
UR: "spells matter" prowess (delirium focus?)
UG: Investigate (their are way more G clue trials than W, and there is a G card with U activation)
BW: ... only clue is Behind The Scenes which indicates a weeny theme.
BG: self mill (DFC enchantment)

Maybe you are supposed to "investigate" the themes, or they are just cards you can backup if you P1P1 an enemy rare.
If they were shards:
UBW spirit weenies?
RBG madness?
GUW investigate/clues matter
URB no idea

Fixing seems ~better than OGW/OGW/BFZ but still bad.

Due to the strength of common delirium, I think the archetype is only good if you have uncommons or rares to support it.

I've seen it suggested that each enemy archetype is defined by its uncommon-with-enemy-color-activated-ability.



So WeenieSwarm, NonpermanentSpellsMatter, Delirium, CombatTricks, and Investigate.

Yeah, for sure. But black doesn't have any weenies, and combat tricks is not a theme is it? Quick delirium count:

White: 1 mythic, 1 rare, 3 uncommon, 2 common
Blue: 2 uncommon (1 a constructed plant, and 1 a mill card)
Black: 1 mythic, 1 rare, 3 uncommon, 2 common
Green: 4 rare, 2 uncommon, 3 common
Red: 1 rare, 1 uncommon

So OK Green for sure, but why not white? I actually suspect the overlaps here are leads for Eldrich Moon.

Just played a 5 round sealed pre-release using a BG delerium/self mill strategy. In addition to quite a few delerium cards, key cards were Vessel of Nascency, 2 soul swallowers, Inexorable Blob. There were some others mixed in that did more self mill or got different cards into the graveyard faster like Explosive Apparatus all with the goal of triggering delirium asap and Macabre Waltz for getting things out of the graveyard if the mill went too far.

I won 3 of 5 rounds with it and of the 2 rounds I lost, won at least one game.

I think aggro is going to be big in draft. The removal is clunky and you need 2 4-5 toughness guys to block vampire heelcutter

I believe RW is just agro hard and ur is ur control. Neither of those archetypes in those colors need a mechanical "hook" to work, just the right cards in the pool.

Edit BW tokens but not exclusively tokens.