The issue I have with GW is that, in the end, I either end up with a minor coloured splash or the deck ends up being worse than it would be in another colour combination. For example, GW midrange ends up being a much worse version of GR midrange and it comes up less naturally. A GW deck has never came up naturally in draft tests with the exception of Lands, which is a multicolour archetype. I also don't want to led my drafters into traps like drafting GW Blink instead of UW or WR.
I think this shows up both in the article Dom Harvey mentions and the decks posted elsewhere in Riptide Lab: Most of them are white decks that splash for a bit of ramp or Eternal Witness. And I'm looking for a bit deeper interaction than that. Power level is absolutely a concern, as I'm sure GW is much more palatable at lower levels. So far, the best GW decks I've managed to build look a bit like this:
There's also this, which has a beyond awful mana curve but showcases the power more:
It doesn't look that bad, overwhelming amount of 3 drops aside (Which is fixable, I just need to tweak the cube design a bit). And I'm sure you guys can build a far better deck than I do.
I would love to have Enchantress because I loved that deck, but I don't think it's a good idea. I do run a higher than usual number of enchantments but I see little flexibility to the archetype.