Brackish Blunder is a common Instant card from The Lost Caverns of Ixalan (LCI), collector number 46. Current market price: $0.19 (foil $0.23), TCGplayer market prices via Scryfall.
Return target creature to its owner's hand. If it was tapped, create a Map token. (It's an artifact with "{1}, {T}, Sacrifice this token: Target creature you control explores. Activate only as a sorcery.")