There’s no need to aim spells. Just pull back the slingshot and fire. The spells take care of the rest.
Golden Ducks
Golden ducks that resemble a bath toy fall from the sky and blanket everything below. They don’t have any real ability other than weight. They’ll crush pigs and topple buildings if enough of them settle on a roof.
Blizzard
Frost coats everything in the area, making the material incredibly brittle. Some structures might collapse under their own weight, but most won’t. Follow up Blizzard with the Blues for maximum destruction.
Hot Chili
Golden Ducks and Blizzard can be used anytime, but Hot Chili is really only good for taking out the pigs in one location, unless there are explosive crates nearby. Hot Chili targets one pig, which ignites and explodes. It doesn’t matter how well protected the pig is because this spell ignores structures.
Pig Inflater
A ray gun zaps multiple pigs in the level and causes them to expand to comical proportions. The expanded pigs usually crush or topple structures if they’re on top of them. However, pigs closer to the ground or on sturdy platforms may survive the growth.
Mighty Eagle
There’s not much to say about this spell. It’s a free pass to clearing an area. If you use it, you advance.