終末の時計/Armageddon Clock

Artifact -
At the beginning of your upkeep, put a doom counter on Armageddon Clock. <CR>
At the beginning of your draw step, Armageddon Clock deals damage to each player equal to the number of doom counters on it. <CR>
{4}: Remove a doom counter from Armageddon Clock. Any player may activate this ability but only during any upkeep step.

Artifact -
At the beginning of your upkeep, put a doom counter on Armageddon Clock. <CR>
At the beginning of your draw step, Armageddon Clock deals damage equal to the number of doom counters on it to each player. <CR>
{4}: Remove a doom counter from Armageddon Clock. Any player may activate this ability but only during any upkeep step.

Artifact -
At the beginning of your upkeep, put a doom counter on Armageddon Clock. <CR>
At the beginning of your draw step, Armageddon Clock deals damage to each player equal to the number of doom counters on it. <CR>
{4}: Remove a doom counter from Armageddon Clock. Any player may play this ability but only during any upkeep step.

Artifact -
At the beginning of your upkeep, put a doom counter on Armageddon Clock. <CR>
At the beginning of your draw step, Armageddon Clock deals damage to each player equal to the number of doom counters on it. <CR>
{4}: Remove a doom counter from Armageddon Clock. Any player may activate this ability but only during any upkeep step.