Awhile back, I pushed around the idea of a spaceship TCG based on my experience in EVE Online (speaking of out-of-touch companies), but I never went anywhere with it. The idea of having a command structure like MTCG Commander, and the rest of your deck being built to protect it. The capital would only take damage after all support ships were destroyed, sort of like attacking the player directly in YGO. Using planet cards like energy/mana, like you’re harvesting resources from those planets to built ships for your fleet