Runecarved Obelisk is a uncommon Artifact card from Alchemy: Outlaws of Thunder Junction (YOTJ), collector number 30.
{T}: Add {C}{C}. Put two charge counters on Runecarved Obelisk. {T}, Sacrifice Runecarved Obelisk: Seek a card with the highest mana value among cards in your library with mana value X or less, where X is the number of charge counters on Runecarved Obelisk.