Streetwise Negotiator is a uncommon Creature — Cat Citizen card from The List (PLST), collector number MOM-207. Current market price: $0.07, 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.