Shoreline Looter is a uncommon Creature — Rat Rogue card from Bloomburrow (BLB), collector number 382. Current market price: $0.54 (foil $1.23), TCGplayer market prices via Scryfall.
This creature can't be blocked. Threshold — Whenever this creature deals combat damage to a player, draw a card. Then discard a card unless there are seven or more cards in your graveyard.