Ha! For Challenge # 027. Cascade feels natural for Hybrid, since it only ever appeared on gold cards. Why not give it a mechanic that feeds into caring about color then? I'm assuming that these buggers are part of a cylce of probably 10 cards. They encourage 5 color decks... but... to get maximum value out of them you can probably swing 3 colors and pick and choose a few. Still, they almost automatically trigger each other, which works out great. Who doesn't want to cascade into cascade while getting bonus rewards for doing it?

Naturally, the "draw a card" spell is... everything but blue?

Every color can cantrip. Blue draws cards better, though, so it turns the "draw two cards" on. I'd assume that if I was designing these, I'd print a bunch of mechanics that every color can do: token creatures, counters and a vanilla body springs to mind. Probably have to stretch along color borders, but, to be honest, forcing a 4 color spell to have attributes of all four colors seems a bit of a mistake to me. Very messy. Better it gets its own identity.