Originally inspired by Magic's 'Un-sets' (absurdist, non-competitive, rule-bending cards intended for a silly, fun time) Secret Lairs like this are more collector's items than they are competition-worthy
The only real information we have regarding the set currently comes from Magic: The Gatherings head designer Mark Rosewater, who called it a tentpole booster release like that of Lord of the Rings: Tales Of Middle-earth
Not because of this simple if evocative card back, but because I wrote super cool next to its name in the notes I compiled for this list
Voyager Quickwelder, an artifact itself, keeps your board developing efficiently, while Gearseeker Serpent can hit the battlefield at a steep discount
Each card a player draws from their deck represents a magical spell which can be used to their advantage in battle
Ive excluded [casthaven]Gemstone Caverns[/casthaven] (which essentially lets you turn being on the draw to being on the play), [casthaven]Urborg, Tomb of Yawgmoth[/casthaven], and [casthaven]Vesuva[/casthaven] since they dont produce multiple mana (but can when combined with lands on this list)