Sidris, the venomous

Deathtouch, haste.
{1}{b}{g}: create a 1/1 green and black snake
creature token with deathtouch.
{2}{b}{r}{t}: target opponent loses 3 life.
{2}{b}{r}{g}{t}: Destroy target creature, then
distribute four -1/-1 counters on up to four
target creatures.