Cobrus, The Betrayer

At the beginning of your upkeep, receive 1 poison counter or sacrifice Cobrus, The Betrayer.
Deathtouch, Infect
{b}: Target player's creatures gain deathtouch
until end of turn.
{g}{g}: Target player's creatures gain infect until
end of turn.
{u}{u}{u}{t}: Draw cards equal to your poison
counters.