Evin, Waterdeep Opportunist is a rare Legendary Creature — Human Rogue card from Secret Lair Drop (SLD), collector number 1239. Current market price: $8.70 (foil $9.44), TCGplayer market prices via Scryfall.
Menace Ward—Sacrifice a creature. Evin gets +2/+0 for each Treasure you control. Whenever one or more players sacrifice one or more creatures, you create a tapped Treasure token. This ability triggers only once each turn.