Of course, Im enough of a maniac to play Cascade Wurm, Bituminous Blast, and Bloodbraid Elf in the same deck: "Crazy Cascading Ketita" Creatures (14) 2 Enlisted Wurm 4 Baneslayer Angel 4 Bloodbraid Elf 4 Sprouting Thrinax Planeswalkers (2) 2 Ajani Vengeant Spells (18) 2 Path to Exile 3 Bituminous Blast 3 Lightning Bolt 3 Day of Judgment 3 Maelstrom Pulse 4 Captured Sunlight Lands (26) 1 Plains 2 Forest 2 Mountain 2 Swamp 2 Marsh Flats 2 Sunpetal Grove 2 Verdant Catacombs 3 Arid Mesa 3 Rupture Spire 3 Savage Lands 4 Jungle Shrine Captured Sunlight, for instance), but this is what came up when I Googled Four-Color Cascade Control. In a time when Jund was the only real deck, I saw a similar list in the Magic Online dailies and declared, Im playing that at FNM. This was probably among the most fun decks Ive ever played, mostly because all your cascades were insane

You might not have a place to keep the new cards you just opened, which forces you to cram them into random boxes with your existing Magic decks or makes you buy boxes for your decks
They offer essential flexibility in deck construction
If you reveal a nonland, you can chose to cast the spell, if able, or else to do two damage to a player or two damage to a planeswalker