Purphoros, Bronze-Blooded is harder to run in multicolor decks due to its sneak restrictions, so I'd probably stick to just Mono Red
Some popular cards with alternate win conditions are Biovisionary, Felidar Sovereign, or my favorite, Approach of the Second Sun
Sorin, Grim Nemesis bailed me out against Mardu quite a few times with its removal of opposing planeswalkers, and Nicol Bolas, God-Pharaoh can do the same thing for an additional mana
Slap it on something youre scared of, watch as creatures trade and then do it all again
Its just an inherent flaw in this commander
Unique art and ties to Fallout lore make cards like Nuka-Cola Vending Machine and Wise Mothman highly sought-after among fans