A cards mana value is the total amount of mana required to play it, expressed as a single integer
They have multiple different card stocks for different applications, ranging from standard paper for play-testing to holo-foils that look and feel like real cards
The goal is to have somewhere around 12+ mana, enough to cast and activate Mindslaver each turn, with enough mana to activate something like Academy Ruins to redraw it every turn
But for other Rooms where both abilities are one-use, or more context-dependent effects, there will likely be a dynamic choice about which order to unlock the doors every time theyre played
Kindred Discovery, Elemental Bond, and Estinien Varlineau are the last of the card draw engines, each great in unique ways