Delver Blue has long been a tier 1 deck in Pauper (even before the printing of Delver of Secrets, though that card was what brought it to the very top). The meta is now shifting away from the good matchups into weird and bad territory for Delver. Storm was a good matchup and you seldom saw the good Delver players complain about Infect, but they do fear Cloudpost, Temporal Fissure and Stompy.
So what are the weaknesses of this fantastic deck? Most lists play too few lands (16) and no true card advantage (only Ninja of the Deep Hours) and too many card sorting spells that takes mana and stops them from countering essential turn 2 and 3 plays from the other decks (the culprits are Preordain and Ponder).
So what do you need to do to win with Delver?
Enter: Mezzel, the guy who won the most packs on Magic Online in Pauper during 2011.
Here is his take on Delver, which solves all of the problems above.
Mezzel Delver (Pauper)
4 Cloud of Faeries
4 Delver of Secrets
4 Ninja of the Deep Hours
2 Phantasmal Bear
4 Spellstutter Sprite
3 Spire Golem
Other spells (20)
1 Oona's Grace
3 Piracy Charm
3 Steel Sabotage
2 Stitched Drake
I have been testing his deck a lot. I did it before the bannings and I will continue to do so after the bannings. It is slightly more complicated than the “regular” Delver decks, but I think it has what it takes to make Delver remain a top tier deck in the new meta.
An interview with Mezzel
Alex Ullman writes an excellent article about playing Delver (pre-bannings):
This is a link to the Walkthrough video itself: