Creature â Zombie Cleric
When Custodi Lich enters the battlefield, you become the monarch.
Whenever you become the monarch, target player sacrifices a creature.
Bastien L. Deharme
The game starts with no monarch. Once an effect makes one player the monarch, the game will have exactly one monarch from that point forward.
If the triggered ability that causes the monarch to draw a card goes on the stack, and a different player becomes the monarch before that ability resolves, the first player will still draw the card.
Abilities that trigger whenever you â€œbecome the monarchâ€ trigger only if you arenâ€™t already the monarch. For example, if you are already the monarch as Custodi Lich enters the battlefield, its last ability wonâ€™t trigger.