Mercantile Seaport

Mercantile Seaport enters the battlefield tapped.
When Mercantile Seaport enters the battlefield,
you get a poison counter and lose 1 life. Create a
1/1 black Rat creature token with Contagious
(Whenever this creature blocks or becomes blocked by
a creature, if that creature doesn't have Contagious, it
gains Contagious.)
{u}, {t}: Add one mana of any color that a land an opponent controls could produce.