Storm Fleet Negotiator is a rare Creature — Siren Pirate card from The Lost Caverns of Ixalan Commander (LCC), collector number 78. Current market price: $0.24, TCGplayer market prices via Scryfall.
Flying Parley — Whenever this creature attacks, each player reveals the top card of their library. For each nonland card revealed this way, you create a Map token. Then each player draws a card. (A Map token is an artifact with "{1}, {T}, Sacrifice this token: Target creature you control explores. Activate only as a sorcery.")