Gandalf, Party Guest
At the beginning of combat on your turn, you may cast an instant or sorcery spell with mana value X or less from your hand without paying its mana cost, where X is twice the number of legendary Wizards you control.
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Reglas oficiales (3) · Scryfall
If a spell you cast has {X} in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.
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, such as kicker costs. If the card has any mandatory additional costs, those must be paid to cast the spell.
You choose whether to cast a spell from your hand as Gandalf's triggered ability resolves. You can't wait to cast it later in the turn. Timing restrictions based on the card's types are ignored.