Ill use myself as an example as I go through this, both because I know myself best and also because Im currently going through this
Each Secret Lair could focus on a particular game or theme for example, one might feature Final Fantasy XIIIs cast (Lightning, et al.), another could highlight Final Fantasy XVs heroes , and perhaps a third could be a fun roundup of iconic Chocobos, Moogles, or Cids from across the series (the possibilities are endless, but the speculation of a 15 different Cids Secret Lair has already made rounds in the community in jest!)
Whenever they deal combat damage to one of our opponents, we'll impulse draw the top card of that player's library
2) Kaalia dates back to the first Commander releases, way back in 2011, and even has an oversized card to boot
Engineered Explosives A highly versatile and playable little answer card