Scholar of the Lost Trove

If a spell has {X} in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.

If you wish to cast the target card, you must cast it while the triggered ability is resolving. You can’t cast it later in the turn.

If you cast an artifact spell this way, it won’t be exiled if it would be put into your graveyard this turn.