Rulings

• 2020-11-10
  When the cascade ability resolves, you must exile cards. The only optional part of the ability is whether or not you cast the last card exiled.
• 2020-11-10
  The cascade ability triggers when you cast the spell, meaning that it resolves before that spell. If you cast the card exiled by the cascade ability, that spell will go on the stack above the spell with cascade.
• 2020-11-10
  The cascade ability of the spell you cast and Aurora Phoenix’s return ability can be put on the stack in either order. If you return Aurora Phoenix to your hand first, you do so before exiling any cards for the cascade ability. If the cascade ability resolves first, the spell you cast because of that cascade ability will resolve before you return Aurora Phoenix to your hand. Either way, this all happens before the original spell with cascade resolves.
• 2020-11-10
  Countering the spell with cascade has no effect on the cascade ability.
• 2020-11-10
  The converted mana cost of a spell with cascade is determined only by its mana cost, no matter what the total cost to cast the spell was.
• 2020-11-10
  You don’t have to cast the last card exiled by a cascade ability. If you choose to do so, you’re casting it as a spell. This means that it can be countered, and appropriate abilities trigger (such as if that spell also has cascade).
• 2020-11-10
  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, you must pay those to cast the spell.
• 2020-11-10
  An ability that triggers when a player casts a spell resolves before the spell that caused it to trigger. It resolves even if that spell is countered.
• 2020-11-10
  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.
• 2020-11-10
  You exile the cards face up. All players will be able to see them.
• 2020-11-10
  Aurora Phoenix’s last ability triggers only if it’s in your graveyard immediately after you finish casting the spell with cascade.