ギルドパクトの印章 {5}

アーティファクト

ギルドパクトの印章が戦場に出るに際し、色を２色選ぶ。あなたが各呪文を唱えるためのコストはそれぞれ、選ばれた色のうちその呪文の色である色１色につき{1}少なくなる。

「私はギルド同士が剣を持って街路で争うより、政権の場で言葉を尽くして論争することを望む。」――ジェイス・ベレレン

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Only the English version of a Magic card receives Oracle updates and errata. View this card in English. (Scryfall note)
You must choose two different colors. (2015-11-04)
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. (2015-11-04)
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. (2015-11-04)

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. (2015-11-04)
The cost reduction can apply to alternative costs such as evoke costs. (2015-11-04)
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. (2015-11-04)