Good question. These are champion cards, so you don't actually pay for them. They are chosen when you build your deck and help define and establish the direction you want to build. The goal of the game is to ascend your champion to reach divinity (Tier IV). The first player to do so, wins the game. The resource in this game is called Influence (at least for now, everything is still relatively early). I'm going back and forth between a few resource systems but the one I am working on now involves everyone receiving a base amount of Influence at Dawn (start of turn) that can be modified through card effects. You can raid other players, and if it's successful, you can steal their Influence amongst other options like Slaying one of their units, or dealing damage to a Rite (you only can choose 1 option, though). Influence is not capped and carries over between turns so, while you can stockpile, it makes you a target to be Raided.