The most universal dummy target spell?

[HappyTauren]

Okay, I need a dummy target spell that can target basically anything, from invulnerable air units to structure-classified ground units. Which one is the best?

 

[edo494]

Channel, I believe it can target anything except trees, for that you need eat tree or the one that huntresses has to place owl to the tree

 

[HappyTauren]

I totally forgot about channel because I've had some issues with it, thanks!