Ichor Rats is a uncommon Creature — Phyrexian Rat card from Scars of Mirrodin (SOM), collector number 67. Current market price: $3.85 (foil $13.31), TCGplayer market prices via Scryfall.
Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.) When this creature enters, each player gets a poison counter.