Selenia, Dark Angel is a good commander for this type of deck, if you put multiple activations of her ability on the stack you can pay your whole life total. Reverse the Sands, maybe?
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No problem!
Cool deck. If you're willing to go for some older cards, it could be fun to make a janky Rooftop Storm / Undead Augur deck. With a sac outlet, you can go through a good piece of your deck for free and get a bunch of ETB/death triggers. Necroduality lets you keep the zombies you play for 0 mana and sac the tokens, or draw extra cards.
Nice, I mainly play tiny leaders and edh and a little legacy so I haven't been following modern too closely lately. Since you're running fetchlands, maybe a couple off-color shock lands could work? Steering around Fury and Solitude is understandable. As for Tron, Alpine Moon would be a strong include on the draw. You could also delay the opponent a turn for a Blood Moon with a Silence effect or use a Ritual to get it out early, but I know Modern is short on rituals.
This is a cool deck, white adds a lot to the mono red prison deck. I would recommend Swords to Plowshares for removal, or maybe Prismatic Ending (I don't know how good it is in modern.) Eidolon of Rhetoric is good, but the 1/4 body won't do too much and Rule of Law would be less susceptible to removal. Ethersworn Canonist is another cheaper option, but does nothing against artifact-heavy decks and is more susceptible to removal. I don't think Alpine Moon is doing much in the sideboard as you're already mainboarding Blood Moon. Mesa Enchantress might be good if you want to really lean into the enchantment synergies.
Blue would also be a great color to have in that there are a lot of creatures that draw a card on connecting with the opponent. Stuff like Curiosity.
Right now I'm working on partner half-decks, where I can pick two partner commanders and shuffle their corresponding 49-card decks together to make a completely new commander deck. My Bruse Tarl build is similar to this one. It's a deck idea I've always wanted to capitalize on properly. Maybe Shu Yun would make a good commander for stuff like this?
Maybe replace Shock with Firemaw Kavu? It can hit more creatures and leaves behind a big guy that can crew Aradara Express. Both Krenkos are really good at creating goblin tokens. The new Rundvelt Hordemaster can buff your Goblins and make them better at crewing.
Looking at some of my options, there's Treasured Find, which seems alright, but would take out some Golgari slots like Abrupt Decay and Pernicious Deed, which are some of the stronger cards. I really like Reap the Past in Commander, so I might be able to find a slot for it.
Yeah, I've been looking for alternatives to Eternal Witness. I was thinking Gloomshrieker, but a third of the deck is non-permanents. I'll keep looking.
Some late game bombs can be sea monster tribal like spawing kraken and serpent of yawning depths. It's a bit of a stretch, but if you include Palladium Myr as ramp and a couple clone effects like Phyrexian Metamorph (which are good in any blue deck) you can infinite combo with two Myr Galvanizers and a Palladium Myr. It's one of the first combos I pulled off. Mistform Ultimus is a cool commander, have fun with him!