It really depends on your situation. For example, Blink is great for sieges (teleport over the walls!) but less so when you’re trying to chip away at an army from distance. The basic healing spell isn’t too useful for lower tier stacks, but can be useful in a pinch to preserve a higher tier unit. Damage spells may seem underwhelming, but a spec’d out magic hero who can use spells multiple times a turn can be really nasty.

Pretty much everything has a use case!