Seal of the Guildpact
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As this artifact enters, choose two colors.
Each spell you cast costs 
less to cast for each of the chosen colors it is.
“"I'd rather see the guilds contend together with words in the halls of power, than in the streets with swords." —Jace Beleren”
Illustrated by Franz Vohwinkel
Rulings (6)
Nov 4, 2015
If a spell you cast has 
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 
and you've chosen red and green, you could choose 5 as the value of X and pay 
to cast the spell.
Nov 4, 2015
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.
Nov 4, 2015
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.
Nov 4, 2015
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.
Nov 4, 2015
The cost reduction can apply to alternative costs such as evoke costs.
Nov 4, 2015
You must choose two different colors.
