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But how exactly do you go about building a mana base in a singleton format where the decks are 100 cards

Seriously though, we really should unban Splinter Twin, which holds the record for least logical banning of all time, based on the justification of shaking up the Modern meta for a Pro Tour (Remember when those were a thing?) to get people to watch coverage (Remember when that was a thing?) for a paper Modern tournament (...)

Mana Drain Mana Drain is a definite standout among the best blue cards MTG has ever released simply because its a counterspell that turns defense into an explosive mana advantage on the next turn

That will always be one by default, but can be scaled up quickly by a few power pumping things: Auras like Rancor that are played

MTG Duskmourn Commander Precon decks, ranked 4) Death Toll Death Toll is easily the most underwhelming preconstructed deck in this set