In Spring 2015, three times World Champion Jason Klaczynski piloted a Seismtoad Shaymin deck to the finals of the Spring Regionals, where it beat Virizion Genesect in a very intense match that lasted more than one and a half hours
For unlimited supply Standard sets, the expected value always drops down near or below the cost of a box (for example, the current EV of Strixhaven is $96 for a draft booster and $89 for a set booster), which means cards from Adventures in the Forgotten Realms need to lose roughly half of their value (on average) over the next month or so
In metagames rife with Reliquary Towers and full grips, this is going to be obscenely good (because it'll be like a 30/30, and it will tutor for that Strip Mine, Dust Bowl, and/or Wasteland to destroy the Towers)
Once flipped, she supports long games with discard and reanimation tools
It is a safe thing to curve out into and remains good when ripped late into the game