I LOVE Pummeler and I'm glad we'll get to see it for a while, it's the real reason I decided to
explore energy decks. If you're considering playing a little more conservatively on your sideboard you may want to try out
Sentinel Totem since it's a hoser card for several decks.
Sorcerous Spyglass pairs very nicely with
Spell Pierce and stops so many win conditions and irritating abilities. Finally,
Appetite for the Unnatural hits a lot of threats, including
Solemnity which is a major bummer.
Reason // Believe pairs very well with Stewardess Nissa. I would drop in
Nissa, Vital Force as a one-of. She comes out throwing 5/5 trees, reclaims stuff, ultimates very easily, and with the new change to planeswalkers you can have both out swinging trees like Nissa nunchakus.
Hashep Oasis and
Negate are both great as a 1 or 2 of sideboard or mainboard (I prefer side). My only real gripe would be
Crash the Ramparts,
Built to Smash might be a better pick, but I know how vital is to have trample for this deck and that won't help Tropky or Hydra. Skysovereign is great for late game swings and can really turn things around, I think it's a good inclusion, but maybe 1 would be enough. Have fun swinging with trample for 80 on turn 4
.