6 Jun 2025
If a card in your graveyard has {X} in its mana cost, X is 0 for the purpose of determining its mana value.
6 Jun 2025
For spells on the stack with {X} in their mana costs, use the value chosen for X to determine the spell's mana value.
6 Jun 2025
Krile Baldesion's last ability resolves before the spell that caused it to trigger. It resolves even if that spell is countered or otherwise leaves the stack.