What would you add to Heroes? (creative ideas only!)

Magic - Summon an army of x (the level determines the number) monsters of this faction, all at level 7! This costs 10 wood and 5000 gold, and 50 mana! The magic is called "Summon Legion". And the magic (based on your stories about the Naga) "Naga Queen" - summons 10 Naga, each with 100 health and 15 attack and defense! It costs 40 mana and 5000 of each resource!