Fountain Of Etherblood

As long as you have 20 life, you can't lose life.
{p/c}: You gain 3 life. Any player may activate this
ability only any time they could use a sorcery. It
cost {p/c} more for each additional
activation this turn.
{p/c}, {t}: Prevent the next life gain that would be
obtained by any target by any sources. You may
gain life equal to the life gain prevented this way.