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All of the lands produce green, so you can always cast Manaweft Sliver or Sylvan Caryatid, which help cast everything else in the deck

Surprisingly, some other cool Darkrai like the one from the Japanese Dreamshine collection or the Team Plasma Darkrai promo appear to have gained a ton of value even earlier

Give it a go sometime

Since its casting cost is discounted for each instant and sorcery in your graveyard, so long as you have six, it only costs one blue mana to cast

The end game of this one was my casting Virtue of Persistence and them conceding at 20 after three turns of my resurrecting his Nathan Steuers to go with my own Hostile Investigators

While it's not very expensive, it's barely valuable enough to claim the ninth spot on the list