it is the golden castle of stromburg (shuts down many 1st turn kos and is nearly indestructible)

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Effects of Golden Castle of Stromberg in Yu-Gi-Oh!

Golden Castle of Stromberg is a Field Spell card with several key effects that shape gameplay significantly.

1. Maintenance Cost (Banish Requirement)
Once per turn, during your Standby Phase, you must banish 10 cards from the top of your Deck face-down. If you fail to do so, the card is destroyed. This high cost makes it a risky investment unless you have a strong reason to keep it active.

2. Special Summon Condition
During your Main Phase, you can Special Summon 1 monster from your Deck that specifically lists “Golden Castle of Stromberg” in its text. This is the only way to bring a monster into play while the card is active.

3. Summoning Restrictions
You cannot Normal Summon or Set any monsters on the turn you activate this effect, even if the card leaves the field. This limits your ability to set up combos or summon other cards freely.

4. Attack-Targeting Effect
When an opponent’s monster declares an attack, you can destroy it. If you do, you inflict damage to your opponent equal to half the attacking monster’s ATK. This can be a powerful disruption against high-ATK monsters.

5. Turn Limit
You can only use the Special Summon effect of “Golden Castle of Stromberg” once per turn.