That too is a broken thing to do
and Baba Lysaga, a hag from Barovia and the mother of Tasha, in-fiction author of Tashas Cauldron of Everything
shuffle your Deck, then excavate the top 5 cards of your Deck, destroy monsters on the field up to the number of "Spellbook" cards excavated, also, after that, place the excavated cards on the top of the Deck in any order
As with all other oozes in this mold, it synergizes with token and counter doublers, although its nature as an X-spell gives it a few extra use cases with Magus Lucea Kane, hydra commanders like Zaxara, the Exemplary, or Sovereign Okinec Ahau
While this era doesn't boast the same level of expensive cards you may find in the Sword and Shield era, there are some gorgeous grails to get your hands on
The only real mistake you can make is not starting at all