You don't control any of their permanents, spells, or abilities
Second Place Chalice of the Void Andrea Piemonti Before Modern Horizons, this card was played mostly X=1 and was a tool to beat Lava Spike decks, as well as some other aggro shells
For each card, Im going to list any special versions, the price of those versions, and the EDHREC inclusion
Realmwalker Realmwalker is a reason to run green in typal decks, as you get support for the creature type you want, and playing creature spells from the top of your library is a very strong source of card advantage
Gift of Immortality Gift of Immortality provides a persistent safety net typical of the finest white Auras in MTG that makes even the best black cards in MTG nearly impossible to keep off the board
Some cards in Duskmourn: House of Horror have alternate artwork (and collector numbers) from their main set counterparts that contain a monster of Duskmourn lingering in the background