Even just at your second turn, you could be looking at five or more mana , more than enough to cast a few spells, a higher-cost commander, or some powerful mid-game bomb at the earliest point of the game
Spoilers ahead: Spider-Man didn't die
It gained the most total value of all the Mana Vaults, probably on account of being so gosh darn purdy
It can also be used to grab a card or five here and there as well
Three cards might not be huge, but being able to pay five mana and draw a card is pretty good when your hand is empty later in the game
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