Tezzeret: Wins the Game.
Bargain: Draws cards that may win the game, but might kill you thanks to opposing damage.
Desire: Hit or miss to win the game.
In Poker Terms.
Tezzeret = AA's
Bargain = KK's
Desire: = AK
I don't agree with this approach.
You think about these cards as if we were in a neutral metagame, where each of these three spells would face problems with the exact same probability.
Deal with Tezzeret, with an enchantment like Bargain, or with a Storm spell are completely different things.
The global vintage metagame is completely Artifact-oriented, I mean you will find 20 times more artifact-hate cards, than enchantment-hate cards, and than storm-hate cards in the maindecks and the sideboards of the other players.
Once Bargain is on play, there are few chances to lose the game.
When Desire is cast at 5 or 6 storm, same conclusion.
But concerning Tezzeret, (compared to the two other cards), the more difficult part of the job is not to cast it, it is to keep it alive one turn with at least two counters on it.
As so many cards can deal easily with it (Explosives, Needle, Nature's Claim, Krosan Grip, Pyroblast, REB...without forgetting the strong Ancient Grudge...), that you can't say "Tezzeret : Wins the game".
The correct sentence should be (as written before) : "Tezzeret : wins the game
if not molested", which are usually much harder conditions to obtain. I write this comparing the issue to Bargain and Desire, that are almost "unmolestable". We can't ignore that Tezzeret can be in trouble with a simple 1/1 or 2/2 on the other side, whereas Desire and Bargain don't care with that.