At the end of the draft, you're able to choose from a selection of emblems.
Currently the emblems being considered are:

Land cards you own have Basic Landcycling .

You may pick a card with companion to add to your pool (Use the original companion rule).

Instants and Sorceries you own are Arcane. Creature cards you own are Spirits in addition to their other types.

Nonhuman creature cards you own have mutate X where X is plus the mana cost of the creature.

Whenever the first creature you control dies each turn, choose one - create a 1/1 colorless Spirit creature token, or target creature gets first strike, menace, and haste until end of turn.

Copy every third spell you cast in a turn. You may choose new targets for the copy.

If its not terribly obvious, most of the emblems are supposed to be associated with a wedge, originally the WBG wedge was supposed to be Creatures you control have Outlast but after looking through, there was very little overlap with the other mechanics card-wise so back to the drawing board. Currently thinking of some kind of lifegain (the fact that WG has almost no mechanical overlap with GB and BW other than lifegain and +1/+1 counters is miserable).

The cube is still a work in progress, I still need to come up with an WBG section and then have bunches of cards everywhere where you might want to play with the WBG cards even outside of that specific emblem.