Runecarved Obelisk
Artifact, {4}
Oracle Text
{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.