Notes & Combos

The key to running this deck smoothly is knowing your opponents' decks so you can predict their next move. In fact, I'd say knowing when to activate Magnifica's effects and also Exosister Vadis is the key to winning a lot of matches. A lot of people use Exosister Vadis in the beginning of the main phase but that's wrong because they can just move to Battle Phase and destroy your sisters. Here you go a few tips to maximize their potential against meta decks:

1. YUBEL: MAGNIFICA's effects = Against their first normal summon especially if it's Samsara (banish and transform into Mikailis if an effect is activated). If they summon Phantom right away, don't think twice, activate Returnia so they'll get very vulnerable with card disadvantage. EXO VADIS = during this particular match, don't hesitate and activate Vadis as soon as you see it's Yubel. Why? Because all their cards move out of the GY first and only after that you have the option to chain a card. They also don't have enough attack power to destroy your sisters unless they change their combo routes. And finally, always summon Asophiel. Their deck'll be 80% shut down because of her.
2. S.E./FIRE KINGS: MAGNIFICA'S effects = Banish their field spell as soon as it activate. However if they start with Diabellstar, transform into Mikailis -> Chain 2 --> banish their face-down card and finally banish their normal summon (if it's Ponix, just let it bring the field to banish when it activates, try to save Returnia for face-down cards). Don't let Garuda hit the field because it might get a bit complicated since Kirin's effect doesn't target when it's destroyed and sent to the GY. EXO VADIS = if you have no other option, wait for Poplar's effect to leave the GY and become a continuous spell.
3. BRANDED = Many routes here. If they summon Albaz, just banish it and you're safe. Most of the times Albion will banish cards to fusion summon so use Exo Vadis here or right when they try to send Branded Fusion to the GY if the trap is already there 'cause it's a quick effect and you can lose the timing of Exo Vadis. Then, summon Asophiel so every Branded card will stay in the GY useless during end phase. Also, use Asophiel against Mirrojade to avoid destruction.

Finally, don't be afraid to leave Mikailis + other sister on the field (ideally Martha with Called By set) + Returnia to avoid Nibiru/get around Maxx "C". You'll be able to summon Magnifica/other XYZ sister and still get 2 additional bans.