For spells with in their mana costs, use the value chosen for X to determine if the spellâ€™s converted mana cost is 3 or less. For example, your opponent could cast Burn from Within (a spell with mana cost ) with X equal to 3, but not with X equal to 2.
For more information on meld cards, see the Eldritch Moon mechanics article (https://magic.wizards.com/en/articles/archive/feature/eldritch-moon-mechanics-2016-06-27).
Effects that increase or reduce the cost to cast a spell (such as those of escalate and emerge) donâ€™t affect the spellâ€™s converted mana cost, so they wonâ€™t change whether Briselaâ€™s last ability restricts that spell from being cast.
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