Up for sale is the mechanical Clockwork Avian, a rare card from the Antiquities expansion of Magic: the Gathering. This is the original, black-bordered, English version.
Clockwork Avian: 0/4 Artifact Creature (Bird); with Flying; Clockwork Avian comes into play with four +1/+0 counters on it; Clockwork Avian can't have more than four +1/+0 counters on it; at the end of combat, if Clockwork Avian attacked or blocked this turn, remove a +1/+0 counter from it; spend X mana and tap Clockwork Avian to put X +1/+0 counters on Clockwork Avian; play this Ability only during your upkeep; casting cost 5.
These cards are in Very Fine to Near Mint condition. Most have seen at least some light play.