Qwet-Jal's Sarcophagus

{w}, Sacrifice a creature: gain 1 life, then
distribute X +1/+1 counters among creatures
you control, where X is the amount of life you
have gained this turn.
{b}, Sacrifice a creatue: target opponent loses 1
life, then you may exile X cards from that
player's graveyard, where X is the amount of life
they have lost this turn.