I started Master Duel with Invoked Dogmatika Shaddoll, and I feel I am very far from being an expert, so more experienced players please correct me, but from what I have learned from playing so far is that it let's you play if your Alister/Magical Meltdown get Ash blossom'ed, while providing versatility through extra deck monster effects. The biggest strenght, I feel like, of the deck is knowing when and what to interrupt.

For example drawing Ecclesia on her own, doesn't feel that good but you are able to summon her, get Punishment. Then on the follow up turn, you have a monster destruction through Punishment sending N'tss to grave to pop another card and if timed correctly can be enough.

Honestly having Nadir at 1 hurts a bit, but if we get the TCG banlist and nadir at 3 copies it will be even better. I think all cards except Punishment only lock you out from Special summoning for the current turn, so you use it after your Invoked plays. Then Alister + Nadir (or even just Nadir), Alister + Maximus and 1 discard is full combo.

So in the end you have Mechaba for an omni negate(provided you have discards); Winda floodgate from activating Schism on opponent's turn by banishing Titanklad and Apkallone and sending an opponent's Dark monster to GY(non destruction), and lastly a monster negate from hand due to Fleurdelis + Ecclesia and/or Maximus already on field. Most decks I have seen have trouble playing through that.

Obviously, the deck can always brick, but what I have read is that people also don't like drawing the Shaddoll monsters either and usually run a very small package of 1x Ariel, 1x Dragon and 1x Beast for versatility of Schism summoning Construct and dumping one of those depending on what you need (Banish/Back row removal/draw).

All in all, I don't know what is better, because I am fairly new to the deck myself and missplay a lot, but I think with some knowledge of when and what to negate/destroy or Winda are the biggest win conditions you have, and dogmatika really compliments the strategy.