Stoney
Silence and
Karn would definitely slow your deck down, but Tezzeret only cares that your artifacts are on the battlefield, even if they are just literal rocks at that point. His +2 is his best feature.
Along that line, Stoney
Silence, Nullrod, and
Karn will turn off
Isochron Scepter and Aetherflux too, so you will still be dead in the water on your main win-con.
Have you considered running Tezzeret Stax? Run Nullrod and
Karn,
Cursed Totem, and more. Just slow the game down, hard cast him, and +2 for 8-10 damage a turn.