Biosage's Preserve

Biosage Preserve enters the battlefield tapped.
{t}: Add {c}.
{1}{u}, {t}: If target creature would go to the
graveyard this turn, exile it instead.
{2}{g/u}{g/u}, {t}: Target creature becomes a copy of a creature card exiled with Biosage's Preserve.
You tell me death is a natural part of life, but you
have never known life without it. Let me show you.