Regal Behemoth
Trample When this creature enters, you become the monarch. Whenever you tap a land for mana while you're the monarch, add an additional one mana of any color.
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Official rulings (5) · Scryfall
Being the monarch carries two inherent triggered abilities. "At the beginning of the monarch's end step, that player draws a card" and "Whenever a creature deals combat damage to the monarch, its controller becomes the monarch."
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.
Abilities that trigger whenever you "become the monarch" trigger only if you aren't already the monarch. For example, if you are already the monarch as Custodi Lich enters the battlefield, its last ability won't trigger.
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.
Regal Behemoth's last ability is a triggered mana ability. It doesn't use the stack and can't be responded to.