T-Virus

Whenever a creature dies, target opponent loses 1
life and you gain 1 life.
At the beginning of your end step, if you've
gained 3 or more life this turn, you may place
one target creature card from your graveyard,
on top of your library.
"The biological weapon utilizing the T-Virus has
almost been completed. Our only remaining task is
to acquire combat data." - Albert (Resident Evil: 0)