Fortress Port of Yokosuka

Fortress Port of Yokosuka enters the battlefield tapped.
{t}: Add {r} or {g} to your mana pool.
{1}{r/g}: Fortress Port of Yokosuka becomes a 0/4 Wall creature with defender and reach until end
of turn. It's still a land.
The Fortress provides a safe harbor for the ships of the IJN and their allies.