Mayby I was to relaxed when I wrote the first post. I actually thought the deck out very thoroughly. I would run this deck in a tournament. The cards I chose are to play against the highest level of play. I have not lost a single match so far. In a Tezzeret metagame I don't see how psionic blast could be called a bad choice. When I say I have not lost a single match so far that must mean that this has some potential. Also when I say I play with the cards I like that means I try not to limit myslef to net decking but I will actually think for myself every now and then. If you think this is one for the casual forum I would hate to see what you think of half of the other lists posted on here. I don't come here for petty arguments and I'm not going to roll over and take it.
I guess you're going to play whatever you want to play, and not really take any of our advice. I will try one more time, though.
Psionic Blast costs 3 mana and 2 life. In Vintage, something that costs 3 mana should either draw you a tremendous amount of cards, or win you the game, or both. Examples: Tinker, Yawgmoth's Will, Meditate. If you want something to deal with Tezzeret, Thoughtseize costs a third of the mana and the same 2 life, and also gives you knowledge about your opponent's game-plan. Duress does the same without the loss of life. Will either of them stop a Tezzeret in play? No. But you have 11 counterspells and sundry bounce spells to deal with Tezzeret. Not only that, Psionic Blast does not deal with a Tezzeret with more than 4 counters on it.
If you are really, really worried about Tezzeret being in play, then you can consider the red splash. Red Elemental Blast only costs a single mana, is an instant, and has the added benefit of protecting a lot of your own spells and winning counter battles. The Red splash really isn't all that difficult, either; 2 or 3 Volcanic Island, and you're there. You don't even have to fetch them out against decks that have Wasteland, because REB is the best reason to play red, and even if they have wastelands, you only really need a single red mana at a single point in the game, most of the time.
But the biggest reason to not play Psionic Blast: it's way easier to protect REB or Thoughtseize with Mana Drain. That play only costs 3 mana total, rather than 5.
Incidentally, I Glen Elendra is a really strong card. Really, it is. But the deck already has so many counterspells. It's certainly not better than Mana Drain or Force of Will or Commandeer. If you need more counterspells than that, then I don't know. You probably weren't going to win that game anyway. It is good, believe me. It's probably just unnecessary. But I haven't tested. At the least, it might be worth a sideboard spot or three.
