Belcher isn't good against Stax, but Affinity isn't either.
Well, it depends. If the stax player doesn't resolve the trinisphere/chalice/other annoying card on turn 1, then this deck simply gets more permenates on the table than the stax player. It takes a matter of seconds to turn their Smokestack into card advantage and a lack of annoyance for you. Therefore, the turn 2 and 3 are much better for the Affinity player than the belcher player. However, belcher generally wins by turn 3 anyways, so you can't really compare. Belcher is weaker against the non-workshop control decks though, as force of will + duress/etc. has much more game against belcher than it has against affinity.
And yes, Null Rod IS game
23:09:42 - GreenMycon rolled a 14, using a 20 sided die.
23:09:51 - C9H13NO3 rolled a 12, using a 20 sided die.
23:09:55 - C9H13NO3 says:'you can play'
23:09:58 - GreenMycon says:'cool'
23:09:59 - GreenMycon is shuffling library...
23:10:00 - GreenMycon drew 7 cards.
23:10:03 - C9H13NO3 says:'this deck sucks so it won't matter

'
23:10:04 - C9H13NO3 is shuffling library...
23:10:05 - C9H13NO3 is shuffling library...
23:10:06 - GreenMycon says:'humm.. gimmie a sec to think about this'
23:10:06 - C9H13NO3 drew 7 cards.
23:10:10 - GreenMycon says:'yup.. keep'
23:10:12 - C9H13NO3 says:'paris'
23:10:15 - C9H13NO3 says:'this is ass'
23:10:17 - C9H13NO3 moves a card from C9H13NO3's hand to C9H13NO3's library.
23:10:17 - C9H13NO3 moves a card from C9H13NO3's hand to C9H13NO3's library.
23:10:17 - C9H13NO3 moves a card from C9H13NO3's hand to C9H13NO3's library.
23:10:17 - C9H13NO3 moves a card from C9H13NO3's hand to C9H13NO3's library.
23:10:17 - C9H13NO3 moves a card from C9H13NO3's hand to C9H13NO3's library.
23:10:17 - C9H13NO3 moves a card from C9H13NO3's hand to C9H13NO3's library.
23:10:17 - C9H13NO3 moves a card from C9H13NO3's hand to C9H13NO3's library.
23:10:17 - C9H13NO3 is shuffling library...
23:10:20 - C9H13NO3 drew 6 cards.
23:10:28 - It is now turn 0.
23:10:46 - GreenMycon plays Mox Sapphire.
23:10:46 - Mox Sapphire is tapped.
23:10:47 - GreenMycon plays Ancestral Recall.
23:10:48 - C9H13NO3 says:'i doubt i'll have a response'
23:10:50 - GreenMycon says:'res?'
23:10:52 - C9H13NO3 says:'yeah'
23:10:53 - GreenMycon draws a card.
23:10:53 - GreenMycon draws a card.
23:10:53 - GreenMycon draws a card.
23:10:54 - GreenMycon buries Ancestral Recall.
23:11:00 - GreenMycon plays Mox Pearl.
23:11:12 - GreenMycon plays Glimmervoid.
23:11:18 - Mox Pearl is tapped.
23:11:19 - Glimmervoid is tapped.
23:11:29 - GreenMycon plays Frogmite.
23:11:34 - It is now turn 1.
23:11:34 - It is now the Untap Phase.
23:11:42 - It is now the Upkeep Phase.
23:11:42 - It is now the Draw Phase.
23:11:42 - C9H13NO3 draws a card.
23:11:44 - It is now the Main Phase.
23:11:45 - C9H13NO3 plays Taiga.
23:11:46 - Taiga is tapped.
23:11:47 - C9H13NO3 plays Tinder Wall.
23:11:48 - C9H13NO3 buries Tinder Wall.
23:11:49 - C9H13NO3 plays Null Rod.
23:11:59 - It is now turn 2.
23:11:59 - It is now the Untap Phase.
23:12:01 - GreenMycon says:'maybe I can pull it off'
23:12:03 - GreenMycon says:'lemme try

'
23:12:08 - C9H13NO3 says:'sure'
23:12:10 - Mox Sapphire is untapped.
23:12:10 - Mox Pearl is untapped.
23:12:10 - Glimmervoid is untapped.
23:12:10 - GreenMycon draws a card.
23:12:12 - GreenMycon plays Seat of the Synod.
23:12:19 - Glimmervoid is tapped.
23:12:22 - GreenMycon plays Thoughtcast.
23:12:23 - GreenMycon draws a card.
23:12:23 - GreenMycon draws a card.
23:12:25 - GreenMycon buries Thoughtcast.
23:12:36 - Frogmite is tapped.
23:12:36 - Frogmite is attacking.
23:12:38 - C9H13NO3's life is now 19. (-1)
23:12:38 - C9H13NO3's life is now 18. (-1)
23:12:39 - It is now turn 3.
23:12:39 - It is now the Untap Phase.
23:12:41 - C9H13NO3 says:'pains'
23:12:42 - Taiga is untapped.
23:12:43 - It is now the Upkeep Phase.
23:12:43 - It is now the Draw Phase.
23:12:44 - C9H13NO3 draws a card.
23:12:45 - It is now the Main Phase.
23:12:46 - C9H13NO3 plays Wasteland.
23:12:47 - Wasteland is tapped.
23:12:49 - C9H13NO3 buries Wasteland.
23:12:50 - GreenMycon buries Glimmervoid.
23:12:50 - Taiga is tapped.
23:12:51 - C9H13NO3 plays Grim Lavamancer.
23:12:52 - It is now turn 4.
23:12:52 - It is now the Untap Phase.
23:12:54 - Frogmite is untapped.
23:12:54 - GreenMycon draws a card.
23:12:58 - GreenMycon plays Tolarian Academy.
23:13:04 - Tolarian Academy is tapped.
23:13:08 - GreenMycon plays Thoughtcast.
23:13:09 - GreenMycon draws a card.
23:13:09 - GreenMycon draws a card.
23:13:11 - GreenMycon buries Thoughtcast.
23:13:13 - GreenMycon plays Frogmite.
23:13:34 - C9H13NO3 says:'the frogmites are trippin me out'
23:13:38 - GreenMycon plays Sol Ring.
23:13:54 - GreenMycon plays Myr Enforcer.
23:13:55 - Frogmite is tapped.
23:13:55 - Frogmite is attacking.
23:13:55 - Frogmite is tapped.
23:13:55 - Frogmite is attacking.
23:14:00 - C9H13NO3's life is now 14. (-4)
23:14:02 - It is now turn 5.
23:14:02 - It is now the Untap Phase.
23:14:04 - Taiga is untapped.
23:14:05 - It is now the Upkeep Phase.
23:14:06 - It is now the Draw Phase.
23:14:06 - C9H13NO3 draws a card.
23:14:07 - It is now the Main Phase.
23:14:09 - C9H13NO3 plays Wasteland.
23:14:09 - Wasteland is tapped.
23:14:12 - GreenMycon says:'wow'
23:14:16 - GreenMycon buries Tolarian Academy.
23:14:19 - C9H13NO3 buries Wasteland.
23:14:23 - It is now turn 6.
23:14:23 - It is now the Untap Phase.
23:14:28 - Frogmite is untapped.
23:14:28 - Frogmite is untapped.
23:14:28 - GreenMycon draws a card.
23:14:33 - GreenMycon plays Glimmervoid.
23:14:52 - Glimmervoid is tapped.
23:14:54 - GreenMycon plays Disciple of the Vault.
23:14:56 - Frogmite is tapped.
23:14:56 - Frogmite is attacking.
23:14:56 - Frogmite is tapped.
23:14:56 - Frogmite is attacking.
23:14:56 - Myr Enforcer is tapped.
23:14:56 - Myr Enforcer is attacking.
23:15:06 - C9H13NO3 says:'in response to the disciple'
23:15:09 - Taiga is tapped.
23:15:10 - Grim Lavamancer is tapped.
23:15:13 - C9H13NO3 moves Wasteland from C9H13NO3's graveyard to C9H13NO3's removed from game pile.
23:15:14 - C9H13NO3 moves Wasteland from C9H13NO3's graveyard to C9H13NO3's removed from game pile.
23:15:17 - GreenMycon buries Frogmite.
23:15:19 - C9H13NO3's life is now 8. (-6)
23:15:23 - It is now turn 7.
23:15:23 - It is now the Untap Phase.
23:15:24 - Taiga is untapped.
23:15:24 - Grim Lavamancer is untapped.
23:15:25 - It is now the Upkeep Phase.
23:15:25 - It is now the Draw Phase.
23:15:25 - C9H13NO3 draws a card.
23:15:26 - It is now the Main Phase.
23:15:28 - C9H13NO3 says:'arg'
23:15:29 - C9H13NO3 says:'gg'
Null rod + Wastelands and I still won. Meh.
Is there any room in the deck for Underground Seas at all? It would seem between that and Glimmervoid you could have enough nonartifact mana sources such that Null Rod wouldn't completely end the game (You can still drop moxen followed by free Frogmites, cast disciple/skullclamp off your lands, etc). That might also open up the possibility for adding Chain of Vapor or something maindeck (though having that chained back to you with arcbounds on the table could potentially suck)
There is room for underground seas if you're willing to slow the deck down dramatically. There is undoubtedly an equilibrium between speed and vulnerability of this deck which probably idles at turn 4 on average, as opposed to turn 3. If you're willing to drop the turn 3 win for the turn 4 win, then stick in duress/cabal therapy and drop some artifact land for Underground Seas. I am unsure of what moving the fundemental winning turn to turn 4 would do for the deck as I have not yet tested slowing it down that dramatically.
As for the unpowered build, it seems quite a bit slower than my build and only provides minimal answers to the hate that is a problem with my deck. While welder is nice, it's more of a "I win more late game" card. When the late game isn't a problem for this deck as you'll have immense creatures in play with a ravager + disciple to back them up. Ornithopters in your build can be replaced with the welding jar, which I have found to be truly insane. Ornithopter is only really good when you need the evasion, which isn't necessary in any matchup that I've played.
--Jeff
EDIT:
I have played a few games now with the inclusion of Sphere of Resistance, and well, it works. And it only slows the deck down by a turn (On average). This is great as it allows you to effectively race charbelcher. However, the slight problem is getting the sphere and enough land in your opening hand to effectively use it.