Aragorn, Heir of Isildur

Whenever a Human, Elf, or Spirit enters the battlefield under your control, put a +1/+1 counter on Aragorn, Heir of Isildur. Other Humans, Elves, and Spirits you control get +1/+1 for each counter on Aragorn.
"I do not know what strength is in my blood, but I swear to you I will not let the White City fall"