The main draw is Voltage Burst
Use Trailblazing Historian or The Fire Crystal to give Jumbo Cactuar haste and Ragged Playmate or Rogue's Passage to make it unblockable so you can kill your opponent with one attack for 10,000 damage
Here is where it gets crazy - you can power up a Regi Pokemon, play Thorton, transform that Regi Pokemon into an Amazing Rare Yveltal (Shining Fates), slap on an additional Energy, and OHKO whatever you want
Well, youre playing an inefficient creature Weve seen cards like this a lot, and this kind of effect is generally worse than it looks in Limited
Terapagos ex's Crown Opal move also makes it nearly invincible when fighting against most meta Pokmon, as it prevents all damage done to it by Basic Pokmon aside from Normal types
As we all know PSA can take forever so sitting in limbo for a month or two isnt ideal and feels like a big flaw in the process to me