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I also do think that objectively speaking, there is one card it looses the winner spot to right now

Marvels Spider-Man NEWS Under the Mask with Magic: The Gathering | Marvel's Spider-Man Creative Design Join Aaron, a senior narrative game designer, for the story of how Magic combined comics with cards in this amazing, spectacular, and friendly set

Take a look at our Supercharged Breaker and Paradise Dragona card lists, for a glimpse at what other cards have been emerging from Japan recently.

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