Damnatia Gate

Damnatia Gate enters the battlefield tapped. When Damnatia Gate enters the battlefield, sacrifice it unless you pay 3 life.
When Damnatia Gate enters the battlefield, chose a creature type.
{t} - Add {b}{b} to your mana pool.
{t} - Add {b}{b}{b} to your mana pool. If you do,
pay 5 life.
If your your life total is below 3, sacrifice Damnatia Gate and return all creatures of the chosen type
to the battlefield.