Aragorn, Heir to Gondor

When Aragorn, Heir of Gondor enters the battlefield, target opponent becomes the monarch.
You can't become the monarch the turn Aragorn enters the battlefield.
If damage would be dealt to Aragorn, Heir of
Gondor while you're the monarch, prevent that damage, and put that many +1/+1 counters on
him instead.
The true heir to the kingdom of the white tree.