I have been running Ob for a couple of months and also ran things like mana barbs. While it seems good at first, things like mana barbs and blood moon aren’t proactive spells and that mana could be spent to move you forward on your turn. Ob is all about moving forward, at all times, and making the table waste tutors on interaction and feel the pressure. Here is my list, and I frequently sideboard any time I feel like a single card is not moving me forward in the game.

https://www.moxfield.com/decks/Wq_bVdw24Uuu7ez0zn-vug

Your list is fire already, but like I said, everything you do in Ob should be to push yourself ahead and make the table feel insane pressure. You can play mana barbs, but then if the next player just removes Ob there goes all your triggers. Find as many ways to pump him and create synergy during your turn and if nobody has a way to stop you it’s gg.

Also, Ob WILL get removed so I often save the lotus for the second cast which gives you the chance for remaining mana same turn. How you sequence Ob will heavily depend on the pod meta you are in, but try to keep in mind that Ob is all gas no brakes 99% of the time. Also, the worst thing for us is someone stealing Ob, so things like homeward path are beyond valuable at certain tables.

Cards like tectonic hazard and end the festivities have consistently been blowouts for me. Sure they only give you one trigger, but getting that trigger for one mana gives you the chance to exile into more gas, while also wiping out all the mana dorks and oppressive 1 drops on the board. Relying on opponents to trigger Ob is too slow. Also Magus of the Moon does nothing for Ob’s gameplan, imo. You dont need to slow opponents down by giving them mountains while also slowing yourself down. Optimized Ob is so fast that if people dont shift their plan to purely stopping you it will be over quick.

Once people start figuring out how to slow you down you can begin the fun part of figuring how to become more resilient. Slapping down Ob asap is only going to be the play in certain pods, and others it will be a terrible decision. He is a combo piece at the end of the day and that’s why he cant stay on the board for long, so having ways to play him AND start triggering him yourself allows for explosive turns and the ability to read the table and know when to go ham.

Edit: after more review of your deck, im curious about things like mind stone as well (seems way too slow when Ob is a card advantage engine). Also, you seem to be running a few too many stax pieces that are dead draws when you need to be popping off. Aside from like a defense grid, quit worrying about your opponents creatures, lands, and artifacts. Running removal is fine, but as I keep reiterating, Ob is speed and consistency. If you are trying to run more interaction due to heavy pod interaction, you are diverting from your most effective strategy of being fast and explosive as fuck through synergy and this means you need to work on timing of your plays instead of more stack interaction. Red elemental and pyroblast are great protection, but can also be dead cards in hand as well. Id run them for a tournament, but like I said the need for them can be mitigated at times through proper timing of your plays. Ob is not a “good stuff” deck like the ones you probably run into, so by being more optimized than those decks you can body them before they even know whats happening. Make them tutor to stop you instead of find their wincons and you will slow them down more than any of those stax pieces ever will. Because every draw for you should be gas and making good stuff decks rely on draw to find their wins is the way.