This is represented by reanimating your creatures from the graveyard (and a reference to Celes believing many of her former allies are dead until she finds them again)
Lead MTG designer Mark Rosewater says in a 2023 blog post that Cascade is "easier to manipulate through deck-building, which is a downside from a play design sense, but an upside from a power level sense", compared to Discover
But that simplicity is its strength
youll win the game before you run out of graveyard gas, as it were
For example, if the exiled card is a land card, you may play it only during your main phase while the stack is empty and only if you have an available land play remaining
But perhaps thats because the majority of the new set leans into a more recent interpretation of assassins in Magic : one where the hit is not carried out against a specific creature, but your opponents themselves