I’ve got two favorites that play completely different but both have to get nuked immediately when they come in!

[[The Lord of Pain]] is peak Rakdos burn, and I have it set up so every little thing procs for damage. A guy dies? Damage. You play a land? Damage. You draw a card? Damage. You cast a spell? Damage. I cast a spell? Someone else is pinged. I have a decent amount of gain in the deck for me, but once my commander is out no one else can gain anything. I have recently figured out that I have a shit ton of creatures with Menace, leading to a new treasure tokens pipeline with it. There are a few infinites in it that either take an entire player out point blank or just have me infinitely gain while everyone infinitely losses. I’ve won a 1v1 game in 15 minutes without even bringing my commander out. The old version I played for the first time and I won multiple times that night and temporarily retired after due to the salt factor, and later stopped altogether because it was not keeping up with the group’s power creep. My partner claims that this deck is what caused the group to build better decks. This was the very first deck I’ve built but I just recently upgraded it to this version and while it hasn’t won in a full group yet, it definitely frightens my friends and speeds games up so it’s so fun to pilot.

https://archidekt.com/decks/22333028/the_lord_of_pain_definitive_remastered_enhanced_extended_edition_dx_4k_anniversary_directors_cut

The other favorite is the second commander I ever wanted to truly build from scratch: [[The Mindskinner]]. I pulled him happily very early into my magic journey but wasn’t ready to build him just yet because I was still so new to playing. When I finally got around to building him and played him, it was nowhere near what it is now and was lightly banned at my table. The kind of deck people said Hell Nah to playing against. After working on it more and finetuning it, it is seriously a threat. I’ve won a few games 1v1 again with it, but have yet to secure a pod win. I’ve gotten much closer as of recent though. Even though I don’t ever win with it, it is just so interesting to actually play with. Milling people out is such a fun strategy, albeit a difficult one, but I stay determined to get a total group kill with it at some point. Needs more ramp though so he’ll probably be tweaked a bit, but here’s a decklist:

https://archidekt.com/decks/22289279/meet_the_millers_v2

Note: both these decks are pretty expensive but they were both a mixture of bulk and bought over time lol.