Cheapest priced copy (Fourth Edition): $0.49 at Card Kingdom, near mint, their price list as of .
Armageddon Clock 
Artifact · Rare · Revised Edition · #234
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.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
6 printings · $0.49 to $8.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Revised Edition | 234 | Rare | $0.59 | — |
| Fourth Edition Foreign Black Border | 295 | Rare | — | — |
| Fourth Edition | 295 | Rare | $0.49 | — |
| Antiquities | 37 | Uncommon | $8.99 | — |
| Foreign Black Border | 234 | Rare | — | — |
| Summer Magic / Edgar | 234 | Rare | — | — |
One ruling from Wizards of the Coast
- 4 October 2004Players can remove as many counters as they can pay for each turn.