Cheapest priced copy (Revised Edition): $0.49 at Card Kingdom, near mint, their price list as of .
Clockwork Beast 
Artifact Creature — Beast · 0/4 · Rare · Fifth Edition · #356
This creature enters with seven +1/+0 counters on it.
At end of combat, if this creature attacked or blocked this combat, remove a +1/+0 counter from it.
{X}, {T}: Put up to X +1/+0 counters on this creature. This ability can't cause the total number of +1/+0 counters on this creature to be greater than seven. Activate only during your upkeep.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
16 printings · $0.49 to $599.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Unlimited Edition | 237 | Rare | $10.99 | — |
| 30th Anniversary Edition | 232 | Rare | $14.99 | — |
| 30th Anniversary Edition | 529 | Rare | $159.99 | — |
| Revised Edition | 240 | Rare | $0.49 | — |
| Fourth Edition Foreign Black Border | 307 | Rare | — | — |
| Fourth Edition | 307 | Rare | $0.49 | — |
| Fifth Edition | 356 | Rare | $0.49 | — |
| Beatdown Box Set | 70 | Rare | $0.49 | — |
| Collectors' Edition | 237 | Rare | $4.49 | — |
| Intl. Collectors' Edition | 237 | Rare | $3.49 | — |
| Foreign Black Border | 240 | Rare | — | — |
| Introductory Two-Player Set | 49 | Rare | — | — |
| Limited Edition Alpha | 236 | Rare | $599.99 | — |
| Limited Edition Beta | 237 | Rare | $179.99Out of stock | — |
| Rivals Quick Start Set | 48 | Rare | — | — |
| Summer Magic / Edgar | 240 | Rare | — | — |
5 rulings from Wizards of the Coast
- 4 October 2004Can attack or block even if it has no counters.
- 4 October 2004Loses a counter even if it is affected by a Fog-like effect which prevents it from dealing damage.
- 16 September 2007This is a change from the most recent wording. Now, if some other spell or ability causes +1/+0 counters to be put on Clockwork Beast, it can wind up with more than seven such counters on it.
- 16 September 2007If Clockwork Beast has seven or fewer +1/+0 counters on it when its last ability resolves, it can wind up a maximum of seven such counters on it. If it has seven or more +1/+0 counters on it, the ability will have no effect.
- 16 September 2007Clockwork Beast’s last ability resolves, you can choose to put fewer than X +1/+0 counters on it.