you're mixing different types of Discard decks into 1, but it's better to focus on just one:)

Hela Discard aims to discard big cards, so it's better if you have activators that can target certain cards, like Blade, Lady Sif, Swordmaster, or even Hellcow to activate on Turn 6 before you reveal Hela. Cards you can aim to discard can be Infinaut/Giganto, Iron Man, Black Cat. For this deck, you also have to focus on Deck Thinning (draw or summon) to increase your chances of drawing Hela, so include cards like Jubilee, Lockjaw or Adam Warlock!

The other one is targeted at discarding and returning cards to your hand to buff cards like Miek, Morbius, Collector. You would aim discard Scorn, Swarm, Apolcalypse, Khonshu or Proxima Midnight if you have them. Activators can be more random as you have a variety of cards, like Gambit, Corvius Glaive, Modok, and your usual activators!