There are 4 rare (4.6%) and 2 mythic rare (0.8%) scene cards that can appear in these slots
As you build spell after spell, growth remains linear even as your interactions vary
You want High Tide in the graveyard as soon as possible to exile with Chun-Li so you can use it every attack
Cauldron Familiar is a particularly cool card, and I find myself using it in various popular formats, including Pauper
In Pokmon Trading Card Game Pocket, opening either the Genetic Apex Mewtwo, Pikachu, or Charizard booster packs freely will likely set you back on your way to building a full collection and a competitive deck as each one offers different cards and different early-game rewards
That being said, please let me know if any of these Lairs pique your interest and if you will be getting the entire superdrop or if you will be sticking to singles