Awesome pauper ideas. One thing I would 100% recommend is if you are going R/G to play 4 copies of Burning-Tree Emissary, which combos incredibly well with Horned Kavu
I recently proxied a deck of GR Tron to see what it is all about and have been extremely impressed with how consistent it is. using Firespout against aggro early on and (hopefully) turn 3 Karn makes an easy game. I honestly think GR Tron is one of if not the best deck in the modern format right now, because even while you look for cards like Karn and you Urza lands, you have backups such as Wurmcoil, which I play 3 of.
To beat Tron (GR) what I have found the most consistently good is mono green land destruction. Tron really plays only by getting out your Urza lands, and if you destroy those lands and they have run out of ways to fetch for them, then good game.
To beat Tron (GR) what I have found the most consistently good is mono green land destruction. Tron really plays only by getting out your Urza lands, and if you destroy those lands and they have run out of ways to fetch for them, then good game.
Don't know if this is consistent but it seems to work pretty well and is budget. Another deck I made is here: https://deckstats.net/decks/45453/921671-devastating-mono-red-modern/en
I think this is fun and budget and has surprisingly consistent turn 2/3 kills.