Armageddon Clock

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

Cyclone

At the beginning of your upkeep, put a wind counter on this enchantment, then sacrifice this enchantment unless you pay {G} for each wind counter on it. If you pay, this enchantment deals damage equal to the number of wind counters on it to each creature and each player.