Miss Highwater is a rare Legendary Creature — Demon Advisor card from Mystery Booster: Commander Edition (MBC), collector number 16.
Menace Whenever Miss Highwater deals combat damage to a player who doesn't have a contract counter, they may discard their hand. If they do, they draw seven cards and get a contract counter. For as long as they have a contract counter, when they lose the game, for each artifact and creature they controlled, create a token that's a copy of it.