Urborg Tar Pits

{t},pay 1 life: Add {b} to your mana pool.
When you are inflicted damage, you can pay {b}{b}{b}{b}{b}{b} and sacrifice Urborg Tar Pits, then
flip a coin:
If you win, search for a Elder Horror of the Tar Pits in your library and put it in play, then shuffle your library. If you lose, add {r}{r}{r}{r}{r}{r} to your mana pool.
The predators above are far less intimidating than those below.