The only downside of Thunderbolt is that all energy cards attached to Pikachu must be discarded after attacking, so realistically Thunderbolt can only be used once every other turn assuming the player gets at least one electric energy on Pikachu for their next turn
Koga allows players to return a Muk or Weezing that is in the active spot to their hand
you cannot Special Summon from the Extra Deck for the rest of this turn, except Xyz Monsters, also Special Summon up to 3 "Baby Spider" from your hand and/or Deck, and if you do, they become Level 5, but cannot be used as material for an Xyz Summon, except the Xyz Summon of a DARK monster
In the sideboard, Pinnacle Starcage offers an effect similar to Temporary Lockdown, but with the added advantages of being copyable with Three Steps Ahead and leaving the new Seam Rip untouched
These creatures with the returning prowess keyword get +1/+1 for the turn whenever you cast a noncreature spell
Its the janky dream across time and formats that has long haunted Magic boomers