What kind of magic do you like?

Death Grip and Vampire Touch are truly good and useful spells. If there are bone dragons in the army, applying Vampire Touch to them will result in a very useful warrior against living enemies. However, if the enemy is mechanical (e.g., Dragon Golem) or undead (e.g., Champion of Darkness), these spells will be of no use, neither Death Grip nor Vampire Touch. As for Death Grip... it is very useful against creatures of level 4, except for Champion of Darkness and Minotaur. (For example, a level 70 hero + Chaos magic spell removes 19 creatures.) Of course, there is nothing stopping you from using this spell against other levels, but in my opinion, it is a pointless waste of mana.