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Original URL (likely dead): https://www.channelfireball.com/articles/how-many-colored-mana-sources-do-you-need-to-consistently-cast-your-spells-a-guilds-of-ravnica-update/
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How Many Colored Mana Sources Do You Need to Consistently Cast Your Spells?
Guilds of Ravnica Update (2018)
The 2018 pre-London-mulligan version, preserved for historical and cross-reference value. Still cited when a deck hasn't migrated to the modern tables.
Original URL (likely dead): https://www.channelfireball.com/articles/how-many-colored-mana-sources-do-you-need-to-consistently-cast-your-spells-a-guilds-of-ravnica-update/
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