Up for sale is the mana-making Altar of Shadows, a rare card from the Mirrodin expansion of Magic: the Gathering. These are the original, black-bordered, English version.
Altar of Shadows: Artifact; at the beginning of your precombat main phase, add B to your mana pool for each charge counter on Altar of Shadows; spend 7 mana and tap Altar of Shadows to destroy target Creature; then put a charge counter on Altar of Shadows; casting cost 7.
These cards are all in at least Very Fine condition, with most being in unplayed, Mint/Near Mint condition.
