***CHALLENGE COMPLETE***
Hey - I just got back to NADA after (well, a long while...) and I'm gonna start with this!
HERO deck win: https://i.imgur.com/dhe51nV.png
Deck profile coming soon in an edit to this post!
Deck profile:
https://i.imgur.com/sBphl7n.png
MAIN (40):
3 Cyber Valley - Stall; Draw; Target for Mask Change II
3 Destiny HERO Defender - Stall; Mask Change Target
2 Elemental HERE bubble man - Mask Change Target; Emergency play
3 Elemental HERO Shadow Mist - Searcher for Change cards; Searcher for HEROs; Mask Change target 3 Goblindbergh - Hope to SS a monster for a rank 4, or Mist for a Mask play
3 Mystic Tomato - Search E-Hero Shadow Mist or Yubel
1 Shining Angel - Search Winged Kuriboh or Cyber Valley
3 Yubel - Beating people up with Yubel stuff (3 because it's fairly likely to dro from its own effect in this deck due to the horrible consistancy.)
1 Yubel Terror Incarnate - Beating people up with Yubel stuff
1 Yubel the Ultimate Nightmare - Beating people up with Yubel stuff
1 A Hero Lives - I was considering putting this to 2. Emergency deck startup.
1 Form Change (generally searched with Anki) - Mid BP - devastation
3 Mask Change - Summoning Masked Monsters
3 Mask Change II - (see above)
3 Mask charge (Considering moving to 2 or 1) recycling
1 Reinfrcement of the army - Searching, better than Emegency Call
1 Time-Space trap hole - Defense, barely. For Traptrix.
1 Bottomless trap ho;e - Better defense. For Traptrix.
EXTRA(15):
3 Masked HERO Koga Heavy beating
2 Masked HERO Acid - Clearing and Beating
1 Masked HERO Vapor - Form change; Extenuating circumstances
1 Masked HERO Goka - (see above, considering removing)
1 Masked HERO Dian - Beating; Searching for Shadow Mist (which searches Mask Change) during BP
2 Masked HERO Anki - Beating; keeping field presence with mask changes; search form change if OTK is possible
2 Masked HERO Dark Law- Harassment/Beating
1 Castel, the skyblaster musketeer - removal
1 Traptrix Rafflesia - defense
1 Dark Rebellion XYZ dragon - rolling over any targetable, affectable monster in the game
SIDE(15):
3 Denko Sekka - blocking any set-heavy decks
3 Imperial Iron wall - Kosmos, or similar decks
3 Mask of restrict - Monarchs
1 Jar of Avarice Recycling, against decks that put key cards in the gave too easily
3 Anti-spell fragrance - Murder Pendulums
1 Raigeki - Take a guess.
1 Traptrix Trap Hole Nightmare - Denial, side in if opponent's deck makes this viable at all
I'm considering adding 1 Instant Fusion and Elder Entity Norden, and possibly some more Rank 4s, but I see no need to make this deck a finished  product, given how it can never be truly viable for competition.