You need every Godzilla promo (along with the normal-set version of the Godzilla cards, in both foil and non-foil, of course)
The Mana Base The main mana base comprises three each of basic Forest, Mountain, and Plains lands with the remaining 29 being various lands that tap for one of two colors or have added utility beyond adding mana
You can pick two of them based on nothing more than vibes and personal preference, and the game will automatically create a deck using those two archetypes
The deck plays well out of the box, but it can suffer from relying on Bello, and some amount of divided focus, with sub themes of treasure, token, and ramp
Your rank drops at the end of the season, but it does not reset everyone to zero
Still, putting in a bit of whimsy and showing hope and warmth where its somewhat unexpected as in Eventide makes Gilder Bairn heartwarmingly charming