Losing control of Locke after the last ability has triggered won't affect your ability to cast a spell from among the milled cards
To start, they'll appear on The List more frequently than other cards to make them easier to find
Limits for BC: Since youre focussing on copying and casting spells, be mindful adding cards like Archmage Emeritus and Storm-Kiln Artist because they will likely provide too much free value when further upgrading the deck
Combining card draw (or topdeck access like Mystic Forge and Bolass Citadel) and sacrifice value engines like Krark-Clan Ironworks and Scrap Trawler creates a situation where Umori becomes a game-winning combo piece, rather than just an also-there value card
Her card allows players to retrieve up to four Psychic-type cards from the discard pile and add them to their hand this can be a mix of Basic Energy or Psychic Pokmon
That said, some modern sets have also become fairly pricey, with some of the most expensive sets coming from the Scarlet & Violet era (March 2023-July 2025) and the newest base set, Mega Evolution (September 2025-Present)