The idea, at the time, was that we could create some extra layered complexity by having cards that could take advantage of the fact that most creatures have two creature types on them
This means that Tiamat allows its controller to reliably access their five favorite Dragons, or Dragons key to their strategy in any game, thanks to Tiamat
Of course, you can alter the quantities of each Energy type somewhat if you find yourself running into the same types over and over
We all know how great Arita or Himeno are
Fighting-type Pokmon tend to be really strong in the TCG, and Scarlet & Violet have a lot of really good ones, including Great Tusk ex, Koraidon, Koraidon ex, the aforementioned Stonjourner, and even Klawf
Normally, Modern isn't a format that changes very quickly