Alright here's my first shot at one of these!
The idea is a communal Wonder that players would likely casually contribute to early and mid game(encouraging a diversity of buys), with the option of a sprint towards a VP explosion (or blocking of said explosion) late game with a bit of effort. Also might lead to some unique endgame considerations.
Each step requires a buy and its cost.
Great Ziggurat
Step costs: 0 0 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8
Step: Gain a card that costs the same as this step.
Completion: Each main contributor, starting with the player who completes the Wonder, takes turns removing a step token and gaining a card of that cost until no step tokens remain.
I was originally thinking maybe just one step at each price point (for a more reasonable reward) but I think this really helps balance it for player 2.
