Energy costs cascades into every product cost
They do come into play attacking and are sacrificed at the next end step, so keep the timing of abilities and effect in mind
Assuming that, Perilous Vault is going to be an unusual card for the casual table because future cards like this will probably continue to just destroy, not exile
her abilities allow her to make a "stash" of events at the beginning of the game, and either quickly draw them, or copy via her signatures, but she has only 3 copies of "Painted World" (each working once per game) and has no means to put extra cards beneath her sheet, so this advantage would run out eventually, making her no different than other investigators in how she plays the cards
Mirror Force Mirror Force might be the most iconic trap card in the show's history, and it is Yugi's most commonly used trap card, being present in almost every version of his deck
Its also a really heartless card to toss into your Heartless Hidetsugu deck if youre one of the many dozens of people who play that deck