For five mana, you can untap all your attacking creatures and attack with them again
Whenever two or more creatures you control attack in a band, each creature in that band gets +1/+1 until end of turn for each creature in that band
If the answer is no, you are building a commander-dependent deck
There is definitely room for improvement, and I would argue you could go even lighter on the creatures, taking out some unnecessary ramp or even removing the Monarch mechanic entirely, and instead going with some additional enchantments or spells to really apply the pressure to your opponents
Cid, Freeflier Pilot Cid, Freeflier Pilot is a lot of value, and a cost reducer is always worth a look
Professor Hojo's first ability reduces only the amount of generic mana in the first activated ability you activate during your turn that targets a creature