Up for sale is the polite Common Courtesy, an uncommon card from the Unglued expansion of Magic: the Gathering. These are the original, silver-bordered, English version.
Common Courtesy: Enchantment; whenever a Spell is played, counter it unless its controller asks your permission to play that Spell; you may refuse permission; if you do, counter that Spell and sacrifice Common Courtesy; casting cost 2UU.
These cards are all in at least Very Fine condition, with most being in unplayed, Mint/Near Mint condition.