Hit the Mother Lode

If you can't cast the discovered card (perhaps because there are no legal targets for the spell), you'll put it into your hand.

You exile the cards face up. All players will be able to see them.

If you cast a spell "without paying its mana cost", you can't choose to cast it for any alternative costs. You can, however, pay additional costs. If the spell has any mandatory additional costs, you must pay those to cast it.

You won't create any Treasure tokens until you finish discovering. For example, if the card you discover has "As an additional cost to cast this spell, sacrifice an artifact," you can't sacrifice one of the Treasures from Hit the Mother Lode to pay that additional cost.

A spell's mana value is determined only by its mana cost. Ignore any alternative costs, additional costs, cost increases, or cost reductions.

The mana value of a split card is determined by the combined mana cost of its two halves. If discover allows you to cast a split card, you may cast either half (as long as its mana value is less than or equal to the effect's discover value) but not both halves.