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The Red Lesson Solstice Revelations with flashback for three mana and then exile and cast or draw our top nonland if its cheaper than our Mountain count

Card Errata Before [Your Turn][Once Per Turn] When one of your effects places a digivolution card under this Digimon, this Digimon gets +2000 DP and can't be deleted by your opponent's effects until the end of your opponent's next turn

Enterprising fans could simply print them out, of course, or find someone on a site like Etsy to do it for you

This monster allows you to slowly whittle down your opponents field, and its quite easy to summon in a Dark Magician deck

Adding all of these factors together, it seems like you can expect about 3 mana of value from the dungeon or a little less than 1 mana per room