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The copy that sold for almost half a million is considered the highest quality copy ever seen

Sheltered Thicket

It might not get to stupid amounts of mana ever nor does it get to high amounts that fast but it makes the game go on sufficiently long that it probably has access to more mana over the course of the average game than most cube decks (that don't have an infinite mana combo)

An activated mana ability is one that produces mana as it resolves, not one that costs mana to activate

Extra Water Energy after the 2nd doesn't count

Then in your upkeep, for free, you can Raise Dead and return a Goblin card in your hand, so it's free recursion in your hand each turn, but not mana free to the battlefield