I'm not certain this rival trial is doable - even spending diamonds I couldn't get more than a few done. It's so dependent on random luck of what you get in each board.
Importantly, the wildlife and anniversary event are not a 1-to-1 challenge. Moves per game in wildlife was much lower, - in a day you had 3 games x 25 moves, which is about 750 tubes in this, plus you pay a penalty/game in anniversary. Within that context, the challenges built on luck (n of level 1 tiles) just cannot be done.
Similarly, you run the risk that happened in st pats day, where you were actually in better profit if you did a few, got some boosts, and then stopped because the costs vs reward benefits get way too high.
I am very pro rival challenges, but I just don't this one is doable or worth trying to finish, and I think that's a bad set up for the game.
Few solutions I think could be doable:
1. change the criteria, e.g. early stages just require unlock X wind tiles of any level, or get X wind keys (thats currently part of 1 early one, but it's a really good early one if on it's own). Also more GE quests earlier, that's a great and natural combination given it launches on a Tuesday.
2. Give away tubes as most of the early prize, and give more of them. It means you can play more and try to get further, plus it's a desirable prize to play.
3. scale up prizes better, I don't understand why the boosts seem to be so forward in the prizes, do more of a mix of tubes and boosts, with boosts increasing as you go higher (and higher number of tubes).
4. Change the prices for the tubes, 820 tubes for 1990 diamonds is not reasonable. I think you want people to pay diamonds to play rival (fair enough I spend them, nice motivator that doesn't stop access to full play for non-diamond users), but 820 isn't enough to do rival, even 2 or 3 wouldn't be as is. Give more tubes for that price, so it feels worth buying them and playing rival.
Just my thoughts - again really like rival and want to see it played and integrated, but I don't think this has been successful for this game yet unfortunately.