BGs preseason feedback
If you want people to stop using difficult defenders, I'm all for it. But the idea you put in place is a half measure.
1) the degen should be stronger and count as a % of max health. 10-15% of max health per second will discourage any non saga use. Also add the node that act 9 bosses have that disables any immortality for non saga champs so the likes of fury, serpent, dark Phoenix will not cheat this in any way
2) add a 5% degen of current health to non saga attackers to encourage saga use
3) since you have now limited the pools of attackers and defenders vastly, change the deck size to 20 with 2 bans. Also do some kind of event before the season that gives out like 5 1-2 rank up saga gems and a 2-3 saga gem. Nobody wants to be using 7r1s but a lot of these saga champs are not worth rankups
4) try this meta during next preseason with whatever extra simple nodes you want (like the dash in for fury, or maybe like evade 2 times to get a prowess or something that gives attackers extra damage)
Now we got ourselves something new and interesting