Your biggest value generator gets completely invalidated by a win condition
If you're relatively new and have yet to experience it, trust me, it's only a matter of time
It reads like a junk rare, which is awesome, because I really want to build a Johnny deck around it
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
Then, for seven generic mana, you can "Timey-Wimey" it right into play by time traveling three times
2/1 Bloodbat Summoner Color Indicator: Black Creature Vampire Wizard Flying At the beginning of combat on your turn, up to one target Blood token you control becomes a 2/2 black Bat creature with flying and haste in addition to its other types