Legal in
Legacy, Vintage, Commander, Oathbreaker
Rulings (12)
Due to a 2021 rules change to cascade, not only do you stop exiling cards if you exile a nonland card with lesser mana value than the spell with cascade, but the resulting spell you cast must also have lesser mana value. Previously, in cases where a card's mana value differed from the resulting spell, such as with some modal double-faced cards or cards with an Adventure, you could cast a spell with a higher mana value than the exiled card.
2022-10-07
See also "Returning Keyword Ability: Cascade" in the General Notes section.
2022-10-07
If the card has in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.
2022-10-07
A spell's mana value is determined only by its mana cost. Ignore any alternative costs, additional costs, cost increases, or cost reductions.
2022-10-07