Asriel Dreemurr (represented by Onslaught) 6/7 "On Reveal: Replace ALL locations with 'The Barrier'. (all 4, 5, and 6-cost cards get +2 Power)" This is another Undertale-themed custom card which I have designed and am theorizing decks for. Asriel may not be as flexible a card as his father, but he is still an extremely powerful force. Asriel Dreemurr neutralizes every location and replaces them with a brand new location (which I have also designed), 'The Barrier'. As described in his effect, 'The Barrier' passively gives 4, 5, and 6-Cost cards on both sides +2 Power (including Asriel himself), almost like an alternate version of Lake Hellas for bigger cards. Thanks to the simplicity, fairness, and accessibility of 'The Barrier', it could be easily implemented as a location of Common rarity.
Thanks to his effect, Asriel Dreemurr works extremely well as a large 6-Cost card to be discarded and resurrected with Hela. The boost 'The Barrier' gives would affect every ideal Hela target, as well as many support cards used in Hela decks, like Jubilee and Blink. These two cards also provide you with multiple targets to be empowered by 'The Barrier'. Another reason Asriel Dreemurr works best with Hela is because the deck adds far more 4, 5, and 6-Cost cards to the locations than most decks do.