Septic Rats
Mirrodin Besieged — uncommon
Creature — Phyrexian Rat
Septic Rats rulings:
2011-06-01: A player is poisoned if that player has one or more poison counters.
2011-06-01: Septic Rats gets a maximum of +1/+1 from its ability, no matter how many poison counters the defending player has.