Walking City of Mastodia

{t}: Add {g} or {w} to your mana pool.
{3}{g/w}: Walking City of Mastodia becomes a
1/8 green and white Dinosaur creature with
Defender and Hexproof. It's still a land.
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Over time, humans realized that the plated back
of the Titanosaur could be shaped into their home
in this primeval world.