
You can't get poison counters.
Creatures you control can't have -1/-1 counters put on them.
Creatures your opponents control lose infect.
Melira, Sylvok Outcast has 1 printing, first in New Phyrexia (2011). EDHREC ranks it #11,559 among Commander cards. It appears most in Melira, the Living Cure decks (145 on EDHREC). It has 4 official rulings.
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.