This is the correct amount of clever: noticeable, useful, and not asking the table to read a thesis
Having this kind of effect on a land is solid, not to mention uncounterable (watch out for that land destruction, though)
Future Balrog, as I like to call him, is a legendary creature and demon noble that gives this cascade-based deck a suitable on-brand Warhammer feel
Look, removal attached to an assassin-shaped stick is great in this deck
Wizards of Thay reduces the cost of your instants and sorceries, and myriad allows you to get even bigger discounts because it also allows you to cast your sorcery spells as though they had flash, which is huge for spell slinging decks of all types
You want 50% of your casts to be for one mana for this to be great and it feels like not all decks will be able to do that consistently but it should be pretty easy to setup and draft towards to increase that percentage