A PSA 1 will have major creasing, missing pieces, extreme discoloration, and noticeable warping or other destructive defects
The Epic cards may not feature new artwork, but the glimmer and shine on them and the open air card frame will still make them something worth pulling
They are considered used because they were put into sleeves immediately after purchase
Provided it lasts long enough, or you drop it late enough, it can seriously accelerate your game plan
Some tribes like Kraken/Leviathan/Octopus/Serpent (KLOS) have their own subset of thematic cards like Quest for Ula's Temple or Spawning Kraken, whereas a tribe like dragons has incredible payoffs like Dragon Tempest, Scourge of Valkas, Utvara Hellkite, or Wrathful Red Dragon
The ever-evolving list from Wizards of the Coast bans and restricts previously released cards, so that cards that end up becoming too powerful and give players an unfair advantage can't be used in tournaments