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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Reidane, God of the Worthy Reidane, God of the Worthy is probably my favorite white card this year
This is especially relevant in Vintage, where it prevents Lurrus decks from recurring many of their fast mana sources
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