MScore: 7.3/10
Solstice Revelations
Instant — Lessonuncommon
Exile cards from the top of your library until you exile a nonland card. You may cast that card without paying its mana cost if the spell's mana value is less than the number of Mountains you control. If you don't cast that card this way, put it into your hand.
Flashback 
(You may cast this card from your graveyard for its flashback cost. Then exile it.)
Illustrated by Kotakan · Avatar: The Last Airbender · #153
Rulings for Solstice Revelations
3
2025-10-02
If you cast a card "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, such as sacrificing a creature, those must be paid to cast the card.
2025-10-02
If the exiled card has {X} in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.
2025-10-02
If you wish to cast the exiled card without paying its mana cost, you must cast it while Solstice Revelations is resolving. You can't cast it that way later in the turn. A spell cast this way may be cast at a time you normally wouldn't be able to cast a spell of that type, but other restrictions (such as "Cast this spell only during combat") are enforced.
