Brisela is a spicy lady. Ladies? She'll beat any removal that isn't named Supreme Verdict, races tokens, and wins the game in two swings. Not having haste is really bad, but it still seems like this lady really kicks butt.
Show and Tell doesn't do much with this card(s), but Oath does. Now, it does take two Oath activations to get Lady Gross Voltron assembled, but at least one half of the equation brings the other half back if you hit it first.
I don't know if this is better than that Eldrazi dude who doesn't like players casting Even-casting cost spells, but it's certainly powerful. Ultimately, I think having to dedicate two slots in Oath to your creature is a nobo, especially since the angels on their own don't really do much that is Vintage-relevant. Still, exciting stuff and a worthy card for this kind of art.