so I have this idea that it there would be a pvp arena but raid style. So you have a separate team of 8 and then a random 4 gets picked. They will be on the battle field at the same time, so raid focused dinos have a shot at pvp as well, and the meta more diverse. The arenas would be the same as regular pvp, with players starting on their regular arena count for the first time unles over 5.5k trophies which will be reset to 5499. As for seasonal rewards, it could go as following:
2x number of trophies as random event exclusive common dna
1.5 number of trophies as random event exclusive rare dna
1x number of trophies as random event exclusive epic dna
0.5x number of trophies as random legendary dna
0.25x number of trophies as random unique dna
0.125x number of trophies as random apex dna
you would get to choose which rarity free. You can also select which exact dna you get but you will only get half as much as if you picked random.