Victor, Valgavoth's Seneschal is a rare Legendary Creature — Human Warlock card from Duskmourn: House of Horror Promos (PDSK), collector number 238p. Current market price: $0.34 (foil $0.38), TCGplayer market prices via Scryfall.
Eerie — Whenever an enchantment you control enters and whenever you fully unlock a Room, surveil 2 if this is the first time this ability has resolved this turn. If it's the second time, each opponent discards a card. If it's the third time, put a creature card from a graveyard onto the battlefield under your control.