Making all of your creatures replace themselves buries your opponents in card advantage and makes it hard for them to interact with your board
Everything in the lair is themed around tomb raiding, and lots of it is valuable: Search for Azcanta, Anger of the Gods, Bow of Nylea, Shadowspear, Academy Ruins Through the Wormhole - The cards in this Secret Lair aren't particularly valuable, but the contents - Lightning Greaves, Arcane Signet, Sol Ring, Thought Vessel, and Command Tower - are a complete playset of Commander essentials, in a beautiful and consistent art style by Dani Pendergast
Jowgen was NOT the only issue with this card
You can't digivolve it into a Digimon that requires a yellow Digimon
False Peace says target player, where Empty City Rue says target opponent
Even though the Ultimate level was well established by the time this game released, it did not feature it and every Ultimate level Digimon was treated as a Perfect level card that could evolve from Adult level Digimon naturally