"Frida's Dilemma" - "Rebels" [Campaign 1, Mission 1]

Well, teleport can sometimes be very useful. For example, you have a stack of archers positioned in front of the paladins, but after the Sorceress's turn, because of her magic, she moves earlier. You cast teleport, and the archers are blocked. Also, even with low spellcasting skill, resurrection can help heal a strong unit before the battle ends. For example, that's what happened to me with Godric in the battle against Biara; thanks to his high spellcasting skill, I managed to resurrect almost all the paladins.