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
Ravnica at War is a brutal card in a format like Commander where so many people play multicolored cards, so its a slam-dunk inclusion in any mono-white deck
The intentions of the card are clear, but it would need rules clarification before seeing print in paper
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
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