Not really. It is pretty balanced as both players can't play Item cards, giving both players the same advantage using supporters.
Except we now have a Stadium that can rocket it into play first turn, in addition to a Basic that doubles as draw power all mixed in with at least one amazing draw Supporter still remaining.
Not saying you have to agree with the less-than-thrilled view many of us are taking over this, but if it is hard to understand, try starting from the premise "The format is already quite unbalanced with the vast majority of cards being useless. After years of fighting the "throw your deck at your opponent" trend, once you finally submit... they keep throwing out lock decks that don't slow down the format, just how fast you get to lose unless your deck is already crazy powerful or tailored to beating said lock decks."
People are over reacting. This takes more resources to set up than toad does for a turn 1 Item lock. Also it means that the opponent can't play Items also, having a fair playing field. Players just need to lean towards a little greater Supporter count. This is far from Seismitoad bad, IMO.
Another Evolution cheat is what is so bad; without most of the other garbage I'd be quite thrilled for this
Vileplume. Do remember those that a deck running it will likely be tailored to get around the effect. I mean this isn't new:
Dark Vileplume, from the original
Team Rocket expansion (which released in April 24, 2000). The Evolution cheat means Grass-Types are either going to be pre-nerfed
or risk being broken. Its a lose-lose proposition.
Yes Shiftry will be viable. For those saying the game will be overcentralized, I don't think so. It actually opens up new strageties and get rids of the annoying rule of waiting before evolving. SHIFTRY!
You say "annoying rule" I say "iconic game mechanic that adds meat and strategy to the game".
Split stadiums can be used, and from my experience, can be used efficiently, especially considering Shiftry has a great drawing ability.
True; I just find myself having no Energy to attack and already relying on
Shaymin-EX for speeding up my set-up. I suppose with the new Stadium, the focus is getting out as many
Shiftry as you can, hoping your one Supporter plus their Ability are enough to get the next one and the next one set-up.
For the record though I am of the mind
most decks should run split Stadiums; I found it odd that for the last few formats we had gone back to "One Stadium to rule them all..." since so many decks could benefit as much or more from your own Stadium, but with two you could find one that helps you and at least doesn't help (if not hurts) them.