Armageddon Clock [Revised Edition]

Set: Revised Edition Type: Artifact Rarity: Rare Cost: {6} At the beginning of your upkeep, put a doom counter on Armageddon Clock.At the beginning of your draw step, Armageddon Clock deals damage equal to the number of doom counters on it to each player.{4}: Remove a doom counter from Armageddon Clock. Any player may activate this ability but only during any upkeep step.