Grand Bazaar

{1}, {t}: Add one mana of any color. Spend this
mana only to cast creature spells.
Tap any number of untapped creatures you
control: Grand Bazaar becomes an X/X creature
with trample until end of turn, where X is the
number of creatures tapped this way. It is still
a land. Activate this ability only during
your turn.
"You hope it comes through your lands... Until it does."