Tegweyll works particularly well with the alternate commander from the box, Alela, Cunning Conqueror
If these games go really slow, then some of these might be good at breaking those stalled boards, especially this Crystal
Eight lands in play is the break-even point where you can cast this for free, though you could always run it out earlier, hope it sticks around for a turn cycle, and untap with something like 10 to 12 mana from lands alone
But in Prismatic Evolutions we have a lot of iconic cards coming out as well
5,568 Inclusions, 1% of 647,172 Decks) As much as I like Rex, Cyber-HoundRex, Cyber-Hound as a commander, I'm not actually sure how good a payoff it is outside of that arena
SAR (Special Art Rare) is the newer, higher tier with gold foil borders and unique alternate illustrations often the same Pokemon or trainer as the SR but with a different, more cinematic art direction