I got this senpai.
If you want to go fast, you like red the most, and you always want to accomplish something, Darietti monobrown artifacts with a splash of MLD is a top tier deck in the format. You slap down a million mana rocks, cast darietti, and Decree of Annihilation the entire table, which conveniently misses your commander, and loot yourself into a huge advantage. It's fun, it's strong, and your opponents will not be able to handle you if they haven't seen that kind of deck before.
If that's too slow, because it's mostly a stax deck with incremental advantage into game-winning nonsense, Dranlu Storm is some complicated esoteric nonsense that will win you games. You can run/tutor a doomsday package, have access to literally all the graveyard tech ever printed, and will 110% shit on anyone who hasn't seen it before, at the cost of having 10 minute masturbatory turns.
Now, if neither of those sound like fun, and you don't want to make randoms hate your guts for existing, I suggest Thraximunder. Grixis tends to have a super expensive manabase, which is why I listed it last, and I personally run both monoblue and monoblack decks to skimp on the manabase, but this deck is objectively fun. You run all the creature hate you can, force your opponents to sacrifice everything and never have a creature, then smash face with the full force of grixis. You can run it with extra combat steps, giant fuck-off pump spells, reanimator, really there are way too many options to list them all, but I promise it'll put up a good fight and go faster than the speed of light.
If THAT is still to slow, and it might be, monoblue artifact ramp is always a good bet. You slap down a billion mana rocks, hardcast Jin-Gitaxias t4 or t5, then laugh your way to the bank while you have all the counterspells in the world. I personally run this deck with Venser, and it's a stax deck, but I've hardcast blightsteel almost every game.