Tazri, Beacon of Unity is solid, but with only a handful of Party cards in red and green, five-color really isnt necessary
Pokmon TCG cards included for their ability alone can usually be swapped out for Trainer cards
While some steps may be a bit more complex, especially when they involve multiple players (more about that in a bit), the overall concept is pretty simple: When faced with a villainous choice, a player must choose one of the two options, and then the effects of that option happen
Furthermore, I think the fact that the card is expensive adds to the feeling that the game-warping card isn't something all players have access to
Glorious Anthem or Always Watching can further buff your creatures, and you want to win as fast as possible
Avoid evolving your Urshifu V if possible, so that if the Giratina player chooses to use a Boss or Counter Catcher to get rid of it, they only take two Prizes, not three