Higly suggesting to include in your list "The Tabernacle at Pendrell Vale" cause it's a land and can save some times. And also suggesting to add Yavimaya, because it allows to force your opponents to have forests and it also allows to produce mana with lands such as "The Tabernacle at Pendrell Vale" and "Glacial Chasm". Also suggesting to add "Grief" because it allows to see a hand of opponent before going off and removes potential interruption. And also suggest adding "Leyline of the void" cause based on that you can muligan very aggressively you can find it in your oppening hand pretty often.

do you think Null Brooch can be a good card to protect the combo?

I’m back after a long break. I guess I’ll answer months after the questions I did not reply to… Sorry to everyone.

igorforkst I am not a fan of Null Brooch the 2-mana price tag is not really viable as we rarely have 2 extra mana to spare when Belzenlok is cast. After Belzenlok ETBs, counterspells are not that much of an issue. We have hand disruption through Grief to remove them and if one goes through, we can still threaten a win next turn.

Nempek I added your suggestions. Specially Grief is the single best card that has been printed in the recent years for this deck. Hand disruption during the turn we combo off is huge. It also has a very effective interaction with Sibsig Muckdraggers giving us and additional cheap discard effect. Regarding your second question, I am almost certain that the deck list you linked has a typo. I believe the player used Dread instead of Dread Presence.

xenca Awesome line, honestly, I like the fact that it uses more efficient combo pieces (artifacts that tap for mana). If you don’t have artifact hate in your meta I would 100% try running this line instead of the regular ooze. Despite the more efficient components of this robot ooze, I still believe Necrotic Ooze should be used by default to avoid being shut down by Stony Silence and Null Rod. The other issue I have with it is that it doesn’t gain Skirge Familiar’s activated ability, thus if an opponent attempts to remove Trazyn the Infinite when Argivian Avenger’s haste ability is on the stack with say Path to Exile and you are out of mana you can’t add by discarding and redo the loop.