Slakreg, The Dissolver

Flying, vigilance, first strike
Whenever a Slakreg, The Dissolver enters the battlefield, you gain three poison counters.
{b}{g}, {t}: Slakreg, The Dissolver, gains
deathtouch until end of turn.
{b}{b}{g}, remove a poison counter, {t}: Slakreg,
gains +3/+0, and infect until end of turn.