Up for sale is the bivalved Clam Session, a common card from the Unglued expansion of Magic: the Gathering. These are the original, silver-bordered, English version.
Clam Session: 2/5 Blue Creature (Clamfolk); when Clam Session comes into play, choose a word; during your upkeep, sing at least six words of a song, one of which must be the chosen word, or sacrifice Clam Session; you cannot repeat a song; casting cost 1UU.
These cards are all in at least Very Fine condition, with most being in unplayed, Mint/Near Mint condition.