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Sanctum of Eternity protects your commander from board-wipes or pesky enchantments (and potentially gives you an extra enters the battlefield or leaves the battlefield effect, if your commander has one)

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

Salvage Titan is a huge, black artifact creature that returns from the dead if three artifacts are sacrificed, and Defiant Salvager gets +1/+1 counters on demand by sacrificing artifacts at sorcery speed

This enchantment is another example that really plays well into go-wide decks