Whenever one or more creatures you control each with power greater than its base power deals combat damage to a player, draw a card
Magic also has many cards that trigger when you draw your second card, like Minn, Wily Illusionist, On the Trail, Homunculus Horde, and Zimone and Dina that pair perfectly with the monarchy since your draw step and the end step trigger makes them tick
And what an effect it has: shutting down graveyard strategies like Dredge and Reanimator cold, until the opponent can get rid of it
Level up only as a sorcery.) LEVEL 2-3 3/3 Flying LEVEL 4+ 4/4 Flying Other Merfolk creatures you control get +1/+1
Its a perfect adaptation of how they work in the Final Fantasy games: they take over the battlefield for a short time, perform a powerful move, and then leave