Extender

At least 100, including your commander (any creature). No sideboards are used. Except for basic lands, your deck cannot contain more than one copy of the same card.

Fourth Edition, Fallen Empires, Ice Age, Chronicles, Homelands, Alliances, Mirage, Visions, Fifth Edition, Weatherlight, Portal, Tempest, Stronghold, Exodus, Portal Second Age, Urza’s Saga, Urza’s Legacy, Sixth Edition, Urza’s Destiny, Portal Three Kingdoms, Starter 1999, Mercadian Masques, Nemesis, Prophecy, Invasion, Planeshift, Seventh Edition, Apocalypse, Odyssey, Torment, Judgment, Onslaught, Legions, and Scourge.

Legal cards are limited to original printings from Fallen Empires through Scourge, plus any earlier printings of those cards. No post-Scourge reprints are allowed, in order to preserve the original atmosphere.