What should be added to the top five from the previous installments?

Metallic:D I understand everything about you, but will it say "Iron Maiden" on the back?:D
Someone already suggested making a dragon-golem, which was supposedly in the fourth game. I don't think it's a very good idea... A dragon is a typical fantasy creature, and it shouldn't be made mechanical.
It would be better to add monsters to the seventh level, bring back the eye creatures, add a different type of mage (because the current ones are kind of boring), bring back elemental upgrades, and give us thunderbirds back.