Let's start a side deck thread. Post cards you think are good for this banlist.

Shadow/Light-Imprisoning Mirror (Opposite of your main element, if you use mostly DARK or LIGHT)
Mirror of Oaths (GB Killer)
Chivalry
Nobleman of Crossout (Against Ryko/Hamster loops)
Stun Monsters (DDWL, DCK, Kycoo, Banisher, Wanghu, Rai-Oh) (Depends on your Deck)
Dust Tornado (In case of a lot of continuous S/T)
Prohibition (For single card dependent decks, such as Harpie Ladies)

Imperial Iron Wall too D: (Damn you D.D. decks)

D.D. Crow for your Stardust Am decks
Prohibition, like you saiiiid.
Intercept Wave for your Infernity Swarmers
Gottoms Emergency Call to steal some X-saber's monsters.
Consecrated Light for those pesky dark decks
Pulling the Rug for monarch decks. (D.D. Crow works too)
Effect Veiler (Works for your Stardust AM, your JD, anything you want to trap or stall 'till your next turn. Actually, it would work for Infernity too wouldn't it?)

For anti GB i'd prefer Swallow Flip, because it's a counter trap(un-negateable by the atk 3000 GB fuse monster)and works against Trishula, Junk Destroyer, Mist Wurm, or maybe Arcanite Magician.
Imperial Iron Wall may as well be used against DaD, Chaos Sorcerer, Miracle Fusion,especially nice if you need graveyard but don't need to remove it like treeborn/dandy/Debris/junk synchron related deck.and it also stop BTH dan D-Prison.
Solemn Warning meh, this is usable agaisnt many card without further explaination.
Volcanic Queen maybe? since nothing can negate cost xD
the rest is explained above i guess

Volcanic Queen is beast vs. LaDD/Stardust AM

I actually prefer Mirror of Oaths against GB, rather than Swallow Flip, since it give you the +1, especially when a card, such as Bestari or Laquiri is summoned.

Fortune Ladies are beast against LaDD. You keep one alive, in your standby phase, LaDD is automatically dropped to its lowest attack/defense and can't negate anything else because fortune lady's eff just keeps happening, and LaDD keeps negating it.

oi, oi, 2 problems in siding Fortune Ladies against LaDD is, LaDD can just attack your fortune ladies in your opponent turn. and the 2nd one is what deck other fortune ladies would benefit from Fortune Ladies effect x]

it's more preferable to use lightsworn IMO. (additional note: Lyla, can kill LaDD by activating her effect multiple times because changing it to defense position is also an effect which will be negated by LaDD)

I wasn't denying that, very true.

@Fish: We are not saying what decks pwn other decks. I have actually been in a situation where I had 2 FLs on the field and my opponent summoned LaDD, so I know that, aswell as that being stated in my Fortune Lady Article. Because we are talking about sidedecks, however, FL is crap, since it can only be run in other FL decks. Volcanic Queen, Lyla, Honest, ect. are all cards that can be run in any deck, and therefor are the ones we would need to talk about against LaDD.

Ohh my favorite atm is crevice, if u dont know it look it up on KC

imo, Transmigration Prophecy is better, although, since that's limited, you may have a few of the crevice. I have, however, mained Trans.Prop. in many decks, removing Treeborn, Debris Targets, Monster Reborn Targets, ect. Forget D.D. Crow, Trans is more Pro.

Intercept Wave is still a favourite, I found it and couldn't beleive it wasn't limited or banned or otherwise shown. Stardusters can't even escape it.