Hey, well done so far, there's good dunegon flavor here, but I think you can push Sefris more as a better source to venture into the dunegon.

Arcane Signet and Command Tower are staples of Commander to strongly consider adding.

Both of Sefris's abilities can trigger on your opponents turns since his first ability says once each turn therefore consider taking more advantage of a creature going into your graveyard on your opponents turns? Sefris's ability also says from anywhere which means that a creature doesn't have to die it can be discarded or mill into your graveyard to trigger. Here's some cards and interactions that can get a creature into your graveyard during your opponents turns.

• Discard: Tortured Existence
• Self-mill: Doom Whisperer + Haunted Crossroads
• Dies: Reassembling Skeleton + sac outlet such as Viscera Seer

Tortured Existence is one of the better cards with Sefri that has interaction for repeatable venturing and reanimating creatures when you have completed a dungeon. This one drop can trigger Sefris for one mana on each of your opponents turns by discarding a creature card and then recurring a creature. Then on the next turn discard that creature and recur the creature you discarded last turn. For one mana on each players turn you can loop discard and recur the same two creatures to trigger Sefris to venture. Also on opponents turns if you complete a dungeon you get to reanimate on that players turn which is powerful instant speed reanimation that Existence helps with by being able to discard a creature you want to reanimate.

Doom Whisperer 's surveil 2 for the cost of 2 life can be activated on each opponents turn. Surveil lets you choose any number of cards you looked at to put them into your graveyard thus choose at least one card hopefully a creature to trigger Sefris. Haunted Crossroads pairs with Whisperer as a way to repeatedly trigger Sefris for one black mana + 2 life by first putting a creature from your graveyard on top of your library to then surveil away.

Reassembling Skeleton + Viscera Seer is a creature/sac interaction that you can do on opponents turns because you can reanimate Skeleton for two mana. Seer could be replaced with any other sac outlet, the better ones don't cost mana to sac a creature.

If interested I offer more advice including cuts to consider. Good luck with your deck.

multimedia Frist thxs for your input and second yes any ideas are welcome not just what to add but what to cut as well this is a bare bones deck list atm trimming unneeded bloat and adding cards to help are very welcome