Lets start with the easy part of detecting metal pokemon cards: There are only 5 different pokemon metal cards available for now
But this should give you an idea of how to find the best cards for your deck and decide what colors you want to play
Blue planeswalkers, for instance, weave card advantage into their powerful abilities, while artifacts commonly associated with blue provide alternative avenues to draw cards
That's close to the most reps I've had of any format this early
Most multiplayer sets have some amount of goad printed, including Commander precons, Universes Beyond, and unique products like Ravnica: Clue Edition
Lastly, if you dont want to end up with a purchase youd end up regretting, note that its often smarter to buy single cards if you only want one specific hit