Samsara Lotus has an FTK, that's what makes it gets banned in OCG and TCG. Fortunately we don't have the FTK components in DL, but it also means we're more unlikely to get them in DL now.
Grinder Golem is used for Link spam, that's why it got banned.
Ancient Fairy Dragon was banned cause it's effect is not a hard once per turn, meaning if you summon another AFD, you get to use it's effects again. Thus leading to FTKs.
Grass Looks Greener is a auto-win card.
Master Diamond was in the Gem-Knight FTK.
Gold Sarcophagus is to nerf Thunder Dragons, since a lot of TD cards benefit from being banished.
Anoymous
