Doku, God of Poisons

When Doku, God of Poison enters the field, add
a Poison counter to target opponent's creatures. If
a creature has more than 4 counters, it gains
-0/-1 each turn for every counter on it. To add counters, pay {b}{g}.
If Doku is killed, add 3 counters to all opposing creatures.
There is nowhere you can lock me where my poison
won't reach you.