pokemon heat wave arena booster box Japanese Scarlet & Violet Team up with Misty’s Psyduck Heat Wave Arena Booster Box

The other three booster packs are all unique in that they are all sets from the 1990s, or at least highly based on them

You do need a certain number of basics to support them, and if you dont have room for as many basics, you might have to cut down on your fetches some too

The background of this whimsical coloring page

Unfortunately, outside of the Counter Trap Cards, Eldlich does not have anything much in terms of back row protection

It's more active than some owls, and it's compatible with Limiliva, and if you shrink it, it's also compatible with replication techniques, so it's still good

The basic answer is WotC makes that decision each time a new set comes out