regice don´t have requirements like blissey so regice can be effectice way to start the engine.
It is on topic. We are discussing the variations of Magnerock with different preferences in builds. My preference is to use Machamp as a starter pretty much versus the likes of Spiritomb or any other starter. Realistically, Smeargle sets me up on the first turn VERY CONSISTENTLY if they have a Supporter. It is honestly the BEST starter for Magnezone, which nobody seems to have pointed out yet. And if I don't have Smeargle, I'll probably have a way to get him or a T1 Machamp. Regirock doesn't NEED to be used every turn to have a copious amount of energy in play for Magnezone. In fact, I don't even run 2 Regirock in my build. I only use 1 because 2 is usually overkill on your bench space. I just don't see your deck surviving against anything named SP. Especially not anything that has ANY disruption. If I Judge you first turn with Sableye and you don't really get THE NUTS, then you are doomed. That would be a game over. Fact is, I'd run all over your build's face with any of the following: Luxray GL, Roserade GL, Blaziken FB. Good luck getting unlocked with your 2-3 Warps that you can't search out because you don't run Poke-Drawer. <_<
PS . . . I haven't lost to pure Magnerock with my Luxchomp in 4 matches with it throughout my States run this year. So, agree to disagree, but a good Luxchomp player shats all over it. Utilize Luxray's Bright Look to kill anything not named Magnezone, and snipe the Rocks with Garchomp. Done deal.
There is a ruleing on regice (and also registell) so you can use the power with no effect and still discard. Regirock cannot through
Interesting, you said Smeargle was the best starter, but you're using Spiritomb. I don't see your argument...
And even with Spiritomb, you can still miss the T2 Magnezone. I've had it happen a few times. And as long as you have a hand at all, unless it's full of Energy cards, Vilegar will always be a threat. Especially with as many cards as the deck draws.
Blissey may not be NEEDED, but she's an effective source of discard. Plus, she has no requirements, unlike Regice or Regirock, so you can discard at will to start your engine.
Seeker is bad for this deck. You're picking up a stage 2 that, unless a BTS is down or you have multiple candies, is going to take you two turns to put down and power up, and given the fact that this will most likely be mid- to late-game, that increases the chances of getting sniped off the bench.