Which units would you like to replace or add?

Exactly. I don't even always hire Djinns, but I always build an extra structure for gold. Accelerated Golems are incredibly powerful, especially considering they can't be slowed down. I just had a quick reminder of how strong they are, and I think there's nothing better than them on the third level (well, except for Elven Archers; but even that's debatable, although Elves are definitely more useful). For level 1, Gremlins are decent, but because the Mage hero doesn't increase attack, they don't deal much damage. However, this isn't a problem with the Gremlins, but with the Academy – it doesn't train its graduates very well.