Looks like that deck has only a few ways/cards to activate "Maiden with Eyes of Blue"'s effect. Nowadays there are quite a few cards that prevent you from using monsters' card effects, especially "Utopia the Lightning" will surely give you 5000 damage to you without letting you SS "BWD" if he attacks "Maiden". It's not wise to expect your opponent to allow you to use "Maiden"'s effect. Therefore I recommend you to add more cards that can target "Maiden" so that you can SS "BWD" via her effect before your opponent does something worse to her.
[Recommended Cards]"Skill Prisoner" - allows you to use "Maiden"'s effect 2 times with protecting her
"Stardust Spark Dragon" - can target "Maiden" for free during either player's turn
"Scrap Dragon" - can destroy any card on the field. If you control both this card and "Beelze", target "Beelze".
"Fiendish Chain" - negates the effect of "Evilswarm Ophion", "Archlord Kristya" and so on. In addition, you can prepare to SS "Tefnuit"
"Performapal Turn Toad" - can activate "Maiden"'s effect every turn without paying any cost.
"Legendary Maju Garzett" - will help you OTK. By Tributing a "Hieratic" monster(s), you can access to Rank 8 or 6 Xyz.
Here is my test deck that I made of your deck. Hope you will get any idea from it.
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