How about a new coin...call it Poker Chip Coin
You can mine the coin like normal, but you can also wager the chip back into the pot. Wagered chips give you less difficult future rounds (and higher odds of solving future blocks). But it would have to be a some mathematical odds for your wager. Almost like a lottery but with higher odds or greater possible returns. Is this doable?
Almost anything is doable, but I don't know who can do it