With the Leyline, that's a four-card combo, which doesn't sound too troublesome, but the issue is there are multiple cards that can fill the roles of pump spell or turn one sacrifice fodder, making it more consistent than it would normally be
Prismatic includes standard , and reverse holo , as well as Pok Ball, and Master Ball foil patterns
play up to 1 Character card with a cost of 2 or less rested
1 Mountain
This is because as long as Archelos is untapped, other permanents enter the battlefield untapped and as long as Archelos is tapped, other permanents enter the battlefield tapped
I'm personally not very optimistic about the future of all the various crossover products coming down the pike based on this, but I do understand that Games Workshop has some extremely restrictive controls on their IP that makes working with them and their lore rather challenging