Sello del Pacto entre Gremios
Seal of the Guildpact
As this artifact enters, choose two colors. Each spell you cast costs {1} less to cast for each of the chosen colors it is.
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Reglas oficiales (6) · Scryfall
If a spell you cast has {X} in its mana cost, you choose the value of X before calculating the spell's total cost. For example, if that spell's mana cost is {X}{R}{G} and you've chosen red and green, you could choose 5 as the value of X and pay {3}{R}{G} to cast the spell.
If there are additional costs to cast a spell, or if the cost to cast a spell is increased by an effect (such as the one created by Thalia, Guardian of Thraben's ability), apply those increases before applying cost reductions.
Seal of the Guildpact's last ability doesn't change the mana cost or mana value of any spell. It changes only the total cost you pay.
You must choose two different colors.
The cost reduction can apply to alternative costs such as evoke costs.
Seal of the Guildpact's last ability can't reduce the amount of colored mana you pay for a spell. It reduces only the generic component of that cost.