
Sorcery
Each opponent exiles cards from the top of their library until they have exiled cards with total mana value 5 or greater this way. Until end of turn, you may cast cards exiled this way without paying their mana costs.
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If a card in a library has in its mana cost, X is 0 for the purpose of determining its mana value.
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 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.