Imperial Dragon Coliseum

Imperial Dragon Coliseum enters the battlefield
tapped.
{t}: Add {c}, gain 1 life if you control a Dragon.
Pay 2 life or sacrifice a creature and {t}: Add one
mana of any color. Target opponent must pay 1
life or sacrifice a creature.
"A little Blood on the sands of fire, and the wheels
of he whole city move in jubilation."