Creatures (30) 3 Giant Killer 4 Seasoned Hallowblade 3 Skyclave Apparition 4 Luminarch Aspirant 2 Halvar, God of Battle 3 Usher of the Fallen 2 Reidane, God of the Worthy 4 Professor of Symbology 1 Mila, Crafty Companion 4 Retriever Phoenix Planeswalkers (3) Lands (23) Spells (4) This is a classic deckbuilding study
This mechanic is the perfect way to represent the classic Summons from Final Fantasy (also variously known as Espers, Aeons and Eidolons depending on the series entry)
So if you cast this in your first main phase, then go to combat, you will get the mana when your second main phase starts
It'll destroy either a creature or a planeswalker
If an Equipment with reconfigure somehow loses its abilities while it is attached, the effect causing it to not be a creature continues to apply until it becomes unattached
Also note that if you remain the Monarch in your upkeep for a round of turns, you'll make a free 5/5 flying Dragon token