Up for sale is the doom-tolling Armageddon Clock, a rare card from the Revised (3rd) Edition of Magic: the Gathering. This is the original, white-bordered, English version.
Armageddon Clock: Artifact; at the beginning of your upkeep, put a doom counter on Armageddon Clock; at the beginning of your draw step, Armageddon Clock deals damage to each player equal to the number of doom counters on it; spend 4 mana to remove a doom counter from Armageddon Clock; any player may play this Ability but only during any upkeep step; casting cost 6.
These cards are all in at least Very Fine condition, with most being in unplayed, Mint/Near Mint condition.