Melira, Mirrodin's Despair

Infect
You can't get poison counters.
Whenever a creature, spell, or ability you control
would give an opponent a poison counter, that
many counters plus one are given instead.
Whenever a creature, spell, or ability you control
would put a -1/-1 on a creature you don't control,
that many counters plus one are put instead.
Creatures you control gain infect.