Clockwork Beast is a rare Artifact Creature — Beast card from Revised Edition (3ED), collector number 240. Current market price: $0.79, TCGplayer market prices via Scryfall.
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.