Think Unown swarms, Espeon, Umbreon, and fossil-themed oddities
While it might be tempting to pick up the Dinosaur legends now in case they spike more as Ixalan nears, I'd hold off
Sideboards and decks are always in flux, but its important to stay on top of trends and understand how an opponent may change their deck so that you can build and use you sideboard appropriately
The recent shortage of Pokemon TCG cards kicked off with a new set called Surging Sparks which launched in November
Tomb of Annihilation doesnt need to go in your deck, and venture into the dungeon effects are plentiful, meaning you can conjure The Atropal almost as an afterthought
A black "Edition 1" stamp on the lower left of a Base Set card marks the rarest print and can mean six figures on a Charizard