What spell combinations are there?

Hello, forum users. I apologize if a similar topic already exists, but I think I've checked everything (on the main discussion page for Heroes 4), but I couldn't find it. So, back to the topic. What useful spell combinations do you know? So far, I only have one: "Mirage" + "Accuracy" = defense and attack for ranged units (Crossbowman, Ballista, Halfling, Centaur, Titan, etc.). It's very useful. Tell me what you know. If I discover anything else, I'll let you know.