Noxious Sliver

{g}{b}: Sliver creatures you control have Infect until the end of this turn.
{t}: Destroy target non-sliver creature an opponent controls, your opponent gains 1 life and you lose 1 life.
"The very air around it is a noxious fume which robs you of breath within moments and life shortly after. The sliver's kin seemed eager to be near it."