This type has a long legacy in the game and is unlikely to leave any time soon, as N's Reshiram, one of the most famous Pokmon of all time, will be released with the return of Trainer's Pokmon at the beginning of 2025
Given how PTCGP has a maximum deck size of twenty cards and not more than two copies each, maxing out on both these cards essentially cuts your deck down to almost half
The best way to accomplish this is having Scrap Soldier in the Graveyard (using Foolish Burial, Scrap Shark or Scrapstom for example) and Scrap Chimera on the hand (by drawing or getting it in the graveyard and then using the recycle effect present on most scrap cards) and normal summon it
Of course, your opponents get seven cards, too
With Wizards new focus on inter-set synergy, I wouldn't be at all surprised to see at least one and possibly both of Gishath and Zacama in Commander Masters this summer