R/W Identity: Purge the Monsters!

The last of my color pairings here is probably intentionally going to have the smallest footprint in the set.

Red and white combined will be the best pairing for taking out the various corrupted, mutated, and overgrown beasts of Guthreham. That's not really much of an identity. It's what the two colors already do. 

I don't see this being a set where people would be drafting red and white. They just really don't have a lot of identity in common. But I did want to make sure they are at least playable together.

Here's a common red creature who will be helpful early on against mutating decks:

So this is going to be a little different from U/W's control of big beasts because it's based on aggression. U/W is much more defensive. R/W is going to destroy them all.

Here's a way for white to both control and be aggressive in its typical exile enchant effect:

So you remove an opponent's creature and potentially make one of yours a bigger beater. And there are red mutate creatures, so this could partner well with your own monsters if you want to be a big ol' hypocrite.

The signpost card is a sorcery, which is about as big a sign that you can get that this set is not trying to push you to play these two colors together. But it is a nice card:

So I've defined identities as best I can for each of the color pairings. I need to figure out what the artifact components look like and what I want to do with non-basic and dual lands. A set about an overgrowing plane begs for some land weirdness, but I'm really not sure of an approach yet.