First printed in Mirrodin Besieged (2011)
Septic Rats 
Creature — Phyrexian Rat
Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)
Whenever this creature attacks, if defending player is poisoned, it gets +1/+1 until end of turn.
2/2
- Illustrated by
- Cos Koniotis
- Watermark
- Phyrexian
Legality
- Legal in
- Modern, Legacy, Vintage, Commander, Duel Commander, PreDH, Tiny Leaders, Oathbreaker
- Not legal in
- Standard, Pioneer, Pauper, Future Standard, Historic, Timeless, Alchemy, Penny Dreadful, Premodern, Old School 93/94, Gladiator, Pauper Commander, Brawl, Standard Brawl, Competitive Brawl
Rulings (2)
- A player is poisoned if that player has one or more poison counters.
- Septic Rats gets a maximum of +1/+1 from its ability, no matter how many poison counters the defending player has.
Prices
MTGO price: 0.003 TIX, the cheapest non-foil print (average sell price on GoatBots, 29 Oct 2026).