Streetwise Negotiator is a uncommon Creature — Cat Citizen card from March of the Machine (MOM), collector number 207. Current market price: $0.22 (foil $0.04), TCGplayer market prices via Scryfall.
Backup 1 (When this creature enters, put a +1/+1 counter on target creature. If that's another creature, it gains the following ability until end of turn.) This creature assigns combat damage equal to its toughness rather than its power.