After beating a total of 16 bosses, comprising Club Masters and Team Great Rocket bosses, you face the original four Grand Masters and then two more mini-bosses until you come up to King Biruritchi himself where you have a best-of-three match
So, building around TAUC mechanics like convoke and station is a way to access game-breaking tempo plays essentially for free, as a reward for doing something which is already valuable on its own at all points of the game
Pokmon may only evolve once per turn, and may not evolve on the turn they are played
As for Tawnos, Urzas Apprentice, well, Gavin Verhey once used him as an example in why they only do two new commanders for decks these days
(The most dangerous part of an opponent drawing a lot of cards is their ability to cast lots of powerful spells in one turn, so that's why affecting the number of spells they can cast is a great aspect of this list.) Cards that can make an opponent discard their entire hand, even if lets them draw 4 or fewer cards afterwards