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.
Last observed on Scryfall 2 months ago at $0.46. Over the trailing 90 days the price moved between $0.34 and $0.50 across 45 observations. Cross-checked across TCGplayer, eBay sold, Cardmarket EU, and Star City.
This printing is one of 2 catalogued treatments from C15 — the lineup includes Nonfoil alongside the standard finish. Across our catalog the Rarix library tracks every variant in the same family so collectors can compare price, scarcity and demand inside a single lineage.
Card #54 of *Commander 2015*, the set that shipped alongside the November 2015 Commander 2015 release.
Card type: Artifact, printed at rare. Rares occupy the bottom-of-pack rare slot in standard boosters. Mana cost: {5} (5 converted).
Legal in Legacy, Vintage, and Commander.
EDHrec ranks this card #12,153 in Commander, putting it in the fringe-play tier of the format's playable pool.
Illustrated by Franz Vohwinkel. Rarix catalogs 555 other cards credited to this artist.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Franz Vohwinkel
Card data via Scryfall. Rarix is fan-made; not endorsed by the rights holders.
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.
