Rulings

• 2005-10-01
  You can’t pay the cost of the second ability unless Sunforger is attached to a creature.
• 2005-10-01
  Any card you find must be legally castable (for example, you have to be able to choose a legal target for it). If you can’t find a castable card (or choose not to), nothing happens and you shuffle your library.
• 2005-10-01
  The card is cast from your library, not your hand. You choose modes, pay additional costs, choose targets, etc. for the spell as normal when casting it. Any X in the mana cost will be 0. Alternative costs can’t be paid.
• 2020-08-07
  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 card has any mandatory additional costs, those must be paid to cast the spell.
• 2020-08-07
  You can’t pay the cost of unattaching Sunforger unless Sunforger is attached to a creature.
• 2020-08-07
  If a spell has in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.