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Instead of playing a bunch of different dual lands you could play some of the lands that tap for 5 colors of mana. Sliver Hive, Ancient Ziggurat, Cavern of Souls, Mana Confluence and the major ones that I can think of off the top of my head. Also, you could play homing sliver instead of Summoner's Pact not really sure if it makes much of a difference though.
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