The mana value of a spell isn’t changed by alternative costs, cost increases, or cost reductions. For example, if you cast Thrumming Hivepool (an artifact with affinity for Slivers), its mana value is 6 no matter how many Slivers you controlled when you cast it.

For spells with {X} in their mana costs, use the value chosen for X to determine the spell’s mana value.

Unravel : règles, fonctionnement et interactions (MTG)

Unravel is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Counter target spell. If the amount of mana spent to cast that spell was less than its mana value, you draw a card.

How it works : Unravel

Original English text — Wizards of the Coast / Scryfall

#1July 25, 2025· Wizards of the Coast
The mana value of a spell isn’t changed by alternative costs, cost increases, or cost reductions. For example, if you cast Thrumming Hivepool (an artifact with affinity for Slivers), its mana value is 6 no matter how many Slivers you controlled when you cast it.
No other card is named in this ruling.
#2July 25, 2025· Wizards of the Coast
For spells with in their mana costs, use the value chosen for X to determine the spell’s mana value.
No other card is named in this ruling.