Begin With the Leyline
Leyline of the Guildpact is a deck cornerstone for multicolor builds from Murders at Karlov Manor. As an enchantment that can start the game already on the battlefield when it is in your opening hand, it changes mulligan math and opens up complex lines of play on turn one. The card flattens color concerns by making each nonland permanent you control every color and giving your lands every basic land type in addition to their other types.
Practically this card smooths casting costs and enables synergies that care about color identity and land types in the same package. It supports combo lines that require specific colors, it powers off hybrid and color dependent activated abilities, and it turns utility lands into all sources of the basics you need. For players who value consistency and want to exploit both color and land type interactions, Leyline of the Guildpact is a strategic inclusion rather than a decorative one.
Card Details:
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Mana Cost {W}{U}{B}{R}{G}
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Card Type Enchantment
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Subtypes None
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Card Text / Rules Text (Printed) If Leyline of the Guildpact is in your opening hand, you may begin the game with it on the battlefield. Each nonland permanent you control is all colors. Lands you control are every basic land type in addition to their other types.