I havent done these in a long while, because making these always takes a horribly long time
You can start as many Dungeons as you like, but you must finish an individual Dungeon before restarting it
As a smoothing mechanic, this has been the most revisited typecycling variant, albeit after a long hiatus: Alara Reborn , which printed the first cards with two landcycling abilities, then a decade passed before March of the Machine , The Lord of the Rings: Tales of Middle-earth , The Lost Caverns of Ixalan , and Duskmourn: House of Horror , which all had a cycle of commons with appropriately colored landcycling
they can be parlayed into gain
This card is great alongside either Commander to keep the cards flowing and provide you the resources to generate energy