Use card effects Character cards and your leader can use the effects listed in their card text
While I don't think Invasion of Pyrulea is format-defining or anything like that, it does seem like it could be a solid role player thanks to the number of powerful double-faced cards that currently exist in Standard
Remove all damage counters from Kadabra
Eldritch Immunity If by any chance a player is looking to end the game, has a solid board state, but is waiting for their turn, they'll need some sort of protection spell
Although we dont have any official statements on how dual Ink type cards will work, it seems safe to assume that they probably are cards that count for two different Inks
As in the tabletop original, players create decks of 60 cards made up of various Pokmon, items and allies