Act 2 Quest 1. Both paths have a saga champ that costs 2 energy
the new dailies have 2 per path
easy duel, do it over 4 days for zero energy
Heavy finishing blow against SAGA champ.
Search “Fantastic” (since Fan-4 members are Saga).
3rd one down, Morbius is also Saga. low level, single Heavy.
I personally used this; first fight in lowest difficulty is 2 energy, then drop out and restart, if you REALLY just want to grind it.
also, the yellow border teams in the 3* arena for the event will have at least one Saga champ. zero energy, more grindy (?), but actually good Solo Event prizes for the amount of work.