Luffy, Aspiring Captain

Captain of the Going Merry (You can have two commanders if one of them is The Going Merry)

Reach, Indestructible

When a non-legendary creature enters the battlefield under your control, if you have not played a creature of that type yet this game, that creature is promoted to legendary.
For each legendary creature card in your graveyard, put a +1/+1 counter on Luffy, Aspiring Captain.