Eye of Ojer Taq

T: Add one mana of any color. Craft with two that share a card type 6 (6, Exile this artifact, Exile the two from among other permanents you control and/or cards from your graveyard: Return this card transformed under its owner's control. Craft only as a sorcery.) // Apex Observatory Apex Observatory enters the battlefield tapped. As it enters, choose a card type shared among two exiled cards used to craft it. T: The next spell you cast this turn of the chosen type can be cast without paying its mana cost.

Though they had never left the Core, the Oltec knew the stars.