Its a player designation, not an effect, ability, or trigger, which means you are the monarch (
Nezahel, Primal Tide, represented by Monster Hunter Tri's flagship beastie, Lagiacrus, is the main selling point here
Of course, you have to pay and one life for the privilege
Put the exiled cards on the bottom of your library in a random order.) A spell's mana value is determined only by its mana cost
At 3 mana, its a little expensive to be used as a follow-up to your back-and-forth counterspell war on the stack, but it's a fine way to remove the 100,000,000 instances of Goblin Bombardments effect
Playing enchantments that dont do anything the turn they enter always has risks, but its pretty easy to sequence this into a turn where you play something like Birds of Paradise or Paradise Druid to get a card straight away