In the mid-game, Kifrah with her mines simply destroys all neutral creatures... and here's how I upgraded her this time:
1.
Leadership through the aura of speed.
2.
Luck through a lucky wizard.
3.
And magic with wisdom – the result is level 3 magic in our arsenal (fireball or ice ring).
Well, and the mines hold up simply better than all the others, and with luck, they deal good damage to strong neutrals and provide great help in battles against other players.