You'll end up looking to your typical cards like shock lands, filter lands, and even maybe some of the new hotness (in this case, Overgrown Farmland)
Heres some of the advice I give it: First, I want you to brainstorm some ideas for the flavor text
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
If you have just a Grizzly Bears, it draws you three cards and is a 3/3 creature
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