Moni Crown

When Moni Crown enters the battlefield, you become the monarch
Equip {3}
If you are the monarch, Moni Crown has Equip {1}
Equipped creature gets +1/+3
Any player may equip moni crown to their creatures.
At the beginning of the controller of Moni Crowns end step, if its equipped to a creature, put a -1/-1 counter on that creature.