Once per turn, Golden Castle of Stromberg allows you to Special Summon from your Deck a monster that specifically lists “Golden Castle of Stromberg” in its text. Use this effect to Special Summon Prinzessin or Glife the Phantom Bird. If you do activate this effect, you can’t Normal Summon or Set during this turn and you can’t activate another Golden Castle of Stromberg to Special Summon another monster either.
If an opponent's monster declares an attack while Golden Castle of Stromberg is face-up on your side of the field, that monster is destroyed and your opponent takes damage equal to half its ATK. Since this is a Continuous Effect, Ancient Gear Reactor Dragon and Armades, Keeper of Boundaries are not able to prevent it, but it’s also true that the Field Spell does not negate the attack, which means that, if your opponent has an Ancient Gear Fortress and Ancient Gear Reactor Dragon was Summoned during that turn, the monster will not be destroyed, your opponent will take no damage and the attack will go through.
During your Standby Phase, Golden Castle of Stromberg will banish the top ten cards of your Deck face-down. If you are unable to pay the cost, the Field Spell will automatically be destroyed and no card will be banished.
If Prinzessin is Normal or Special Summoned, it allows you to Special Summon a Pumpkin Carriage from your hand or Deck and then, if Golden Castle of Stromberg is on the field, you can equip a “Glass Slippers” to Prinzessin directly from your Deck.
Pumpkin Carriage allows Prinzessin to attack your opponent directly, it prevents your opponent from targeting Golden Castle of Stromberg with card effects and Golden Castle from being destroyed by them. Your Field Spell can still be banished and, if you don’t have enough cards left in your Deck to banish, it will still destroy itself during your Standby Phase.
You can Special Summon Glife the Phantom Bird from your Deck via Golden Castle of Stromberg’s effect or simply Normal Summon it. If it’s Summoned, Glife will allow you to target and destroy a card in your opponent’s Spell & Trap Zone.
By discarding it, Glife the Phantom Bird also allows you to search Golden Castle of Stromberg, which is, as you may have already noticed, quite an important card. Glife notably increases the consistency of this deck while also providing situational back row removal.
Gren Maju da Eiza’s ATK and DEF are equal to the number of cards you have that are removed from play. During each of your Standby Phases, Golden Castle of Stromberg will banish ten cards from the top of your Deck, increasing Gren Maju’s ATK and DEF by 4000. Being able to Normal Summon a monster with 4000 or 8000 ATK and DEF, even if it has pretty much no protection, is nothing to scoff at. This Level 3 Fiend-Type monster represents an alternative victory condition that your opponent may not expect.
Draw Sense: Fire Can be used each time your Life Points decrase by 1500. In the Draw Phase, instead of doing a normal draw, draw a random Fire attribute monster.
Use Solemn Scolding to prevent your opponent from Summoning problematic monsters such as Shi En or Umastryx or to negate cards like Drowning Mirror Force and then activate your Skill to draw Gren Maju Da Eiza. You are going to draw Gren Maju Da Eiza before Golden Castle of Stromberg banishes the top ten cards of your Deck, so you don’t have to worry about randomly losing your secondary victory condition.
We have only one copy of Gren Maju Da Eiza available and, aside from Tour Bus To Forbidden Realms, there is not a consistent way to search it. Draw Sense: FIRE sort of solves this issue, but it also prevents you from running Lava Golem, which is a card that Prinzessin OTK decks love to run for various reasons. Lava Golem can provide burn damage that can potentially close a game and it also gives you a way of getting it rid of monsters like Legendary Six Samurai - Shi En that can negate the activation of your Field Spell.
Pumpkin Carriage only provides protection for your Field Spell; Prinzessin and Pumpkin Carriage itself can still be targeted or destroyed by card effects.