Ore-Rich Stalactite // Cosmium Catalyst

: Add . Spend this mana only to cast an instant or sorcery spell.
Craft with four or more red instant and/or sorcery cards (, Exile this artifact, Exile the four or more from your graveyard: Return this card transformed under its owner's control. Craft only as a sorcery.)
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, : Choose an exiled card used to craft this artifact at random. You may cast that card without paying its mana cost.