Chaque adversaire exile des cartes du dessus de sa bibliothèque jusqu'à ce que ce qu'il ait exilé des cartes d'une valeur de mana totale supérieure ou égale à 5 de cette manière. Jusqu'à la fin du tour, vous pouvez lancer les cartes exilées de cette manière sans payer leur coût de mana.
If a spell you cast has
in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.
Since you are using an alternative cost to cast the spells, you can't pay any other alternative costs. You can, however, pay additional costs, such as kicker costs. If the card has any mandatory additional costs, you must pay those.
If a card in a library has
in its mana cost, X is 0 for the purpose of determining its mana value.