Great ideas for increasing the staking of the game's main token.
Just one point to raise about Governance, you can search old Discord conversations to see why they don't keep it in this game, which is strange for a Web3 thing where governance is in most projects. But to put it more bluntly, most of the tokens are with high rollers, so they could dictate the balance of their favorite cards.
What could maybe control that, is a limit as you said about controlling the power limit.
I think instead of just stacking, it could take into account the player's community history as well, I mean, we have a Gods forum running as well, and there are valuable members there.