On a fun note, this can help the surprisingly-real Wolf Tribal deck in Standard cast its best spells sooner, accelerating into turn three Nightpack Ambusher or Wicked Wolf before following up with Tolsimir, Friend to Wolves, Garruk, Cursed Huntsman and Arlinn, Voice of the Pack
The next step: It would be really cool to be able to easily do a booster draft using the generated sets, or to print the cards and going from nothing to a completete physical set
Theres also Wirewood Symbiote, Mirror Entity, and Harabaz Druid with the changelings for even more infinite mana
Onto more personal opinions, while I dont exactly like Secret Lairs all around, I think a crossover with Arcane (or League of Legends in general) isnt a terrible thing