Jan 2021 here: https://ygoprodeck.com/cyber-dragon-january-2021/
I'll focus on the changes since January for speed!
Main Deck
Cyber Dragon Nachster: Cut from 2 to 1 for deck space and to avoid turn one brickiness.
Cyber Dragon Vier: Makes a return to the Main Deck to act as a chain blocker for
Cyber Dragon Core and to add fuel for
Cybernetic Overflow.
Cyber Eltanin: Cut for the
Red-Eyes Dark Dragoon Package, this is still a card you should consider if on a budget. Similarly D
ark Magician and
Red-Eyes Black Dragon have been added along with
Red-Eyes Fusion.
Cyber Revsystem: To be honest, Revsystem has not been coming in all that useful and I was looking for deckspace.
Dark Ruler No More <
Forbidden Droplet: Droplet still allows you to OTK, it's effect doesn't target and, depending on the cards sent to the GY, your opponent cannot respond to it.
Foolish Burial: Cut for deskpace, it's nice to have, but there are other cards that I want in the deck.
Harpie's Feather Duster: Blanket spell/trap removal is always nice to have!
Monster Reborn: Cut for deckpace, similarly to Foolish Burial, it's nice to have, but not essential.
Pot of Prosperity: Massive consistency boost for the deck, choosing the right cards to banish in a tight Extra Deck can be tough though.
Cybernetic Overflow: Cut to One
Extra Deck
Red-Eyes Dark Dragoon: Incredibly powerful card that has paid dividends since its inclusion
Chimeratech Rampage Dragon: Bumping this back up to two to reflect that I have both
Cyberload Fusion and
Overload Fusion.
Cyber Dragon Nova: You only need the one
Linkuriboh: It's an additional link 1 that's not really needed with
Relinquished Anima in play.
Side Deck
The mainstay of
Heat Wave (for going first) is still there and I've moved
Lightning Storm to the side deck for matches where I'm definitely going second. The other elements reflect the current state of the meta.