There are no good Pendulum targets for Ultimate Slayer so just run your favourite Extra Deck Pend for that
Additionally, there is the possibility of secret cards entering the rotation, which you'll only be able to find by purchasing packs yourselves
And for once, the common cards feel like they belong
Goblin Piledriver is a 2-mana rare that shouldnt be any smaller than a 3/2 when it attacks
This can essentially go on for a while, giving a powerful Water-type Pokemon such as Starmie EX or Gyarados a ton of Water Energy for their powerful attacks
The stuff in the Mairsil deck that no one predicted when the card was first announced but going up later when we had pricing data leads me to believe that even though tribal stuff is obvious to some who think being able to make simple, superficial observations means that all of this is easy, well still be able to make money by seeing what players are actually playing, buying before supply dries up and selling into the increased demand like always