Some lists abroad have used
Welder:
http://www.morphling.de/top8decks.php?id=949 I am very intrigued by the use of a couple welder's in this deck. Returning Vault and Key are obviously very powerful tools, and this is going to be the next thing that I test. Has anyone had any experience with Welder-ed lists that they can speak to?
Hi everyone! The decklist that you can see in this link was made by two of my teammates (Ugo Rivard & Ian Sauvé Team CRET) from Montreal. Some of you might remember Ugo for stealing the top prices at the SCG: Rochester tourneys (more than once!!!) The first time would be when we quebecers brought to the world the name deck "Bomberman"... But for you to know, Ugo wasn't playing "
Bomberman", he was playing
CONTROL SLAVER.
He's doing very very well with this deck from there 'till now. Winning a couple of tournament around Quebec, making a lot of top 4/top 8 appearances, Ugo has a certain fervor for the deck!!! Every now and then the decklist of Control Slaver changed a bit but those were minor modification/tweaking from the original decklist. The shell of the deck will never go away... The deck is doing well in the new "Magic" environment (restriction and all new decks) but needed maybe a new twist to be more consistent. When I showed up with Tezzeret at a
Poker/Ante night, it all gotten started. We talked for hours about how Wizards could remove/make an errata on Time Vault and releasing Tezzeret at the same time!?!? A one card combo, that pitch to Force of Will and Misdirection. Conclusion, we had to play it.
Ok, now we can go back to that quoted decklist. This isn't a Tezzeret decklist with Welders in it... don't get me wrong... it's a CONTROL SLAVER decklist with Tezzeret combo in it. (!?!?!?!?) Same thing, no! Look alike, yes! The approach is totally different if you're playing Tezz or Slaver... you probably won't make the same decisions from one deck to the other because of the card pool/backup plans you have.
Basically, we took out the combo pieces from Control Slaver and replaces them for Tezzeret combo.
-1 Gift Ungiven
-1 Crucible of Worlds
-1 Seat of Synod
+2 Tezzeret
+1 Time Vault
And that the result is called:
MIND OF THE SEEKER.
http://www.deckcheck.net/deck.php?id=21363I tried so hard to make them include 1x Voltaic Key but mission
failed.
They told me over and over that the
Key IS a dead card in your hand 97% of the time.
So her inclusion would be a card disadvantage and card advantage is probably the
Key of this deck!!! (No dead cards in hand)
That's why we play 2x Ancestral Recall (meaning 1x Ancestral Recall main deck and the one in YOUR deck!!)

So that's the idea we had behind our heads when building this deck...
My 2 cents, for now!