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.
Infinite Hourglass
{4}
Artifact
At the beginning of your upkeep, put a time counter on ~this~.
All creatures get +1/+0 for each time counter on ~this~.
{3}: Remove a time counter from ~this~. Any player may activate this ability but only during any upkeep step.