Tormod can remove opponent's graveyard so he can't use his welder.
Except:
* MUD does not run Goblin Welder. wMUD and MUD are really different decks.
* The opponent's Goblin Welder can still play with your own graveyard, and you shut down your abilities to play with your opponent's graveyard.
The second point is the main reason Tormod's Crypt is pretty weak in Welder based Prison mirrors. If you want additional SB cards for this matchup, then up your Rack and Ruin count or add some Fire/Ice (they kill the Metalworker too) or Pyrite Spellbomb (metagame call if you want to run these maindeck, I tend to prefer Pyrite Spellbomb because you *can't* use Ice against Control or Combo to cycle it).
And don't cut Mana Vault and Mana Crypt in this matchup. They put Karn or Rack and Ruin online faster, which is what you want to do.
If you cast a 2 chalice vs a tog he can cast tog, wish and deed, if you want to keep it cast to 3
Yup, but he can't cast Mana Drain, Accumulated Knowledge, Time Walk or Naturalize. This will buy you time to pile up additional lock Components, to cripple him with Wastelands or an active Smokestack, or to find another Chalice you can cast for 3. Chalice of the Void is one of your best weapon against Tog.
As a general advice, don't use Pyrostatic Pillar in wMUD's sideboard. You are not planning to win fast, hence your opponent doesn't care at all about taking damage from the Pillar. This is not Stacker or TNT.