What if for Season 2 of the tournament, Ludia makes it tiered as follows.
Rare Tier - Use any dinosaurs on your squad up to level 10. Since Epic’s don’t even exist below level 11, this would truly just consist of common and rare dinosaurs.
Epic/Legendary Tier - Use any dinosaurs on your squad up to level 20. Since Unique’s start at 21, they would be excluded, but you’d still have the potential for rares and commons.
Free For All Tier - Use any dinosaurs on your team up to level cap (30).
Make the prizes scaled so the Free For All tier offers the greatest reward. Make people only opt into one of the three and don’t allow people to switch. And if you really want to be nice, level down dinosaurs who are above the cap but in the right tier. So let someone use their level 22 Stegodeus in the 20 Epic/Legendary tier, but have it scaled down to level 20.