Playing Spirebluff Canal on turn 4 prevents you from casting Crackling Drake or Thing in the Ice with a realistic threat to transform it immediately or even a hardcast Arclight Phoenix
Sure you have to sac lands but it is better than being dead
And once you have Delirium, Unholy Heat is just ridiculously strong, punishing opponents for playing any top end cards that dont immediately impact the game
If I had to think of a downside to this set (which was damn near impossible), it would be this
Sure, we have Snow White, who hailed from the first ever feature length, cel-animated movie, Snow White and the Seven Dwarfs, but its not as if Disney created Snow White themselves
Compare the size of the card to another known pack fresh card to check for signs of trimming