Generous Plunderer is a mythic Creature — Human Rogue card from The Big Score (BIG), collector number 76. Current market price: $21.89 (foil $28.18), TCGplayer market prices via Scryfall.
Menace At the beginning of your upkeep, you may create a Treasure token. When you do, target opponent creates a tapped Treasure token. Whenever this creature attacks, it deals damage to defending player equal to the number of artifacts they control.