Putting Curiosity onto any of our damage dealing dragons that can deal damage to face is a sure fire way to keep topped up on cards, and the chance at a non-combat win condition was pretty spicy
The Shattergang Brothers have three abilities, each one pertaining to one of those card types
Backgrounds and cards with choose a Background do not interact with cards which have any other partner ability
So, this is Wrath of God, but a little worse if your opponent has the most creatures, and a little better if you do
Thankfully, we probably want Inalla, Archmage Ritualist as commander anyway, since it provide the Wizards Panharmonicon effect from the command zone as well as from the battlefield, which allows Naban, Dean of Iteration to be backup Inalla for even more Wizards ETB fun