Gotham City

Gotham City enters the battlefield tapped.
{t}:Add {b}
As long as you control six or more lands, lands you control have "{t}:Add one mana of any color."
{w}{w}{u}{u}{b}{b}{r}{r}{g}{g},{t},Sacrifice Gotham
City: Search your library for any number of
equipment cards, put them onto the battlefield,
and attach them to target creature you control,
then shuffle your library.