Armageddon Clock
{6}
Artifact
At the beginning of your upkeep, put a doom counter on ~this~.
At the beginning of your draw step, ~this~ deals damage equal to the number of doom counters on it to each player.
{4}: Remove a doom counter from ~this~. Any player may activate this ability but only during any upkeep step.
Imminent Doom
{2}{R}
Enchantment
~this~ enters with a doom counter on it.
Whenever you cast a spell with mana value equal to the number of doom counters on ~this~, ~this~ deals that much damage to any target. Then put a doom counter on ~this~.