This is the strongest, though most restrictive, non-hero resource generator we've seen yet due to is low cost of only 1 resource. It's important to note that all current Superpower cards are hero cards (yes I'm pretending Invulnerability doesn't exist), so you can't actually build a deck around Deft Focus, but some heroes will benefit from it more than others. Here is a list of heroes ranked by how many of their cards can take advantage of Deft Focus. Obviously, this excludes cards like Fruition that are Superpowers but zero cost.
Tier 1: close to an auto-include
Quicksilver (13), Groot (12), Spider-Woman (9)
- Deft Focus is obscene with these heroes simply due to how many Superpower cards they have.
Tier 2: warrants consideration
Hulk (6), She-Hulk (5), Scarlet Witch (5), Thor (5), Spider-Man (5), Captain Marvel (5), Ms. Marvel (5)
- While 5 is a pretty low count for these heroes, they each have strong Superpowers that I usually cast at least twice a game: Hex Bolt, Hammer Throw, Swinging Web Kick, Photonic Blast, and Big Hands, respectively
Iron Man (3): This can only pay for Repulsor Blast, but that card is super powerful and Deft Focus itself brings an energy resource to help justify it
Hope you like my breakdown, and let me know if you've tried it and found success, especially with the Tier 2 heroes!