I've been thinking it would be interesting to run a deck based around the grade 3 that can use trigger effects in the soul and the other grade 3 that can gain the trigger effects that the vanguard gained.
Prometheus, strong bow ulixes, witch of frogs, and atlas would probably be pretty good for such a deck. Even though you wouldn't get any force markers from atlas, it still gives you a card in soul and a draw, as well as the soul charge when used as the first ride. Ulixes and prometheus are pretty self explanatory, a psuedo-revalation from Prometheus and a +2 to soul from Ulixes, which pairs well with prometheus since you know the top card.
Sumanu of divine punishment and Croute are also good cards to potentially design a deck around, since Sumanu has the board wipe in exchange for soulblast 15 and both players draw 3. Very good with some of the battle maiden skills of reducing the next time you soul blast by a certain amount, allowing you to reuse your sumanu skill turn after turn. Sumanu would also help you put your triggers back in deck by just calling them