One if not the worst game mode I experienced so far.
- There is no even starting playfield: If you don't own R-Legendary Heroes (including inspiration) you lose.
- If you don't roll R-Legendary Heroes on your first round you lose.
- If you don't roll Hero upgrades you lose.
- Positioning, combos, bonds, strategy doesn't matter.
Its literally owning the right R-Legendaries and having luck on rolls - Nothing else matters.
In my opinion it should be more like Blade Colosseum. Even starting field for everyone and let lineup & strategy/positioning matter. Maybe alternate between recruiting new Heroes with upgrading them.