I would just say in all honesty just ignore your commander for the most part, if you actually want a competitive deck.
The thing that he is 7 mana, so he only going to represent late game. He also requires a lot of mana to activate his ability, so again late game type of stuff.
So I would build a destroy everything you can type deck that you'd find more helmed by Mogis, God of Slaughter normally. What you can do is look to just keep removing the board as much as you can, with the idea of going into the late game.
That way you can resolve Kazarov, Sengir Pureblood and actually have a shot at just removing whatever your opponents have left.
Braid of Fire is awesome for generating mana for Kazarov.
So if that makes sense don't really worry about the +1/+1 and going Voltron, as you're just going to fail time and time again. Somebody will have removal for the first attack. So then he cost 9 mana to cast, and good luck again. Instead you need to be patient and wait out everybody else removal, while clearing the board yourself until you have like 10+ lands in play.
Then you're really using the 3R ability to wipe out whats going on. It is possible to play some of the double damage cards like Angrath's Marauders or more risky Dictate of the Twin Gods. But that means he'll ping for 4 damage, which is more likely to kill as single shots.
You could look at Horobi, Death's Wail as a way of one shot creatures. Basilisk Collar can give Kazarov deathtouch for the same effect. But I'd be careful about playing cards too specifically around him, for the reasons I pointed out above. That is to say they will do nothing on their own, and 90% of the time, games will be played without him on the board. That is just science
The thing that he is 7 mana, so he only going to represent late game. He also requires a lot of mana to activate his ability, so again late game type of stuff.
So I would build a destroy everything you can type deck that you'd find more helmed by Mogis, God of Slaughter normally. What you can do is look to just keep removing the board as much as you can, with the idea of going into the late game.
That way you can resolve Kazarov, Sengir Pureblood and actually have a shot at just removing whatever your opponents have left.
So you'd pack in all the mass creature removal in red and black. Things like Toxic Deluge, Bontu's Last Reckoning, Fire Covenant, Last One Standing, Damnation, Blasphemous Act, Decree of Pain.
You'd also play what's available as far as all permanent removal, so Nevinyrral's Disk, Oblivion Stone, All Is Dust, Ugin, the Spirit Dragon.
Then when everyone is bleed dry you can evoke the Kazarov, Sengir Pureblood with Pestilence/Pyrohemia/Crypt Rats as cards that you probably held onto.
Braid of Fire is awesome for generating mana for Kazarov.
So if that makes sense don't really worry about the +1/+1 and going Voltron, as you're just going to fail time and time again. Somebody will have removal for the first attack. So then he cost 9 mana to cast, and good luck again. Instead you need to be patient and wait out everybody else removal, while clearing the board yourself until you have like 10+ lands in play.
Then you're really using the 3R ability to wipe out whats going on. It is possible to play some of the double damage cards like Angrath's Marauders or more risky Dictate of the Twin Gods. But that means he'll ping for 4 damage, which is more likely to kill as single shots.
You could look at Horobi, Death's Wail as a way of one shot creatures.
Basilisk Collar can give Kazarov deathtouch for the same effect. But I'd be careful about playing cards too specifically around him, for the reasons I pointed out above. That is to say they will do nothing on their own, and 90% of the time, games will be played without him on the board. That is just science
Cabal Coffers and Urborg, Tomb of Yawgmoth. Make sure you play Expedition Map.
Niv-Mizzet Reborn
Feather, the Redeemed
Estrid, the Masked
Teshar
Tymna/Ravos
Najeela, Blade-Blossom
Firesong & Sunspeaker
Zur the Enchanter
Lazav, the Multifarious
Ishai+Reyhan
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-Prime Speaker Vannifar
---------------------Will & Rowan Kenrith