Canal Courier
Creature — Human Rogue
When this creature enters, you become the monarch.
Whenever this creature and another creature attack different players, this creature can't be blocked this combat.
The most effective roadways in Paliano aren't roads at all.
Illustrated by
The List#CN2-28CommonEnglishLegality
Rulings
Attacking a planeswalker isn’t the same thing as attacking a player. Both Canal Courier and the other creature must attack different players for the last ability to trigger.
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.