Haccon, Heinous Usurper

Whenever Haccon, Heinous Usurper enters the battlefield, you become the monarch and each opponent sacrifices a creature with the highest converted mana cost among creatures they
control.
At the beginning of your upkeep, if you are the monarch, each opponent sacrifices a creature.
"Finally, King's Reach is mine. Now, let's bring it to
its knees."