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Theres a lot of established heuristics on this subject, and a few points I can toss in to help you construct an optimal mana base for Standard, Modern, Pioneer, or whatever MTG format you prefer

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By paying one mana of every color, you get access to The Prismatic Bridge, an Enchantment with a very powerful effect

For example, if you expect a ton of Lingering Souls and Spectral Procession but no Infect, choose Illness in the Ranks in the place of Night of Souls Betrayal

Pokmon Number 1 Trainer Card This card predates the ever-changing, annual Pokmon World Championship cards