Gearfried the Iron Knight

 Joey tells the story of Gearfried the Swordmaster, in one of his Duels. According to his story, Gearfried wields a power so great, that merely holding a weapon resulted in the wide scale devastation of an entire battlefield. Fearful of his own might, he sealed himself in a suit of iron armor to limit his power (represented by this card's effect that destroys any Equip Card equipped to it). This devastation effect can been seen in the ability of Gearfried the Swordmaster to instantly destroy a monster when equipped.

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This card has several counterparts:

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Unsealed: Gearfried the Swordmaster

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Gemini: Phoenix Gearfried

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Upgraded: Immortal Phoenix Gearfried

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Lightray: Lightray Gearfried

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Red-Eyes: Gearfried the Red-Eyes Iron Knight

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Fusion (with Giltia the D. Knight): Gilti-Gearfried the Magical Steel Knight

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This card appears on Dimension Explosion.

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This card is similar to Power Tool Dragon, as both have armored versions of themselves that hides their true form.  Both of their effects (as well as some of the effects of their true forms) also involve Equip Spell Cards.

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OCG Rulings

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If "Blast with Chain" activates as Chain Link 2 or higher and is equipped to "Gearfried the Iron Knight", then "Blast with Chain"s effect will activate after "Gearfried the Iron Knight"s effect resolves.: When "Blast with Chain" equips to "Gearfried the Iron Knight" at Chain Link 2 or higher, when does the effect activate?

Release Restraint: Tributing "Gearfried the Iron Knight" is a cost: Spell Card > Release Restraint

Previously Official Rulings

If you Special Summon "Gearfried the Iron Knight" with "Premature Burial", it is destroyed after it is Special Summoned when its effect destroys "Premature Burial".

Blast with Chain: If you equip this card to "Gearfried the Iron Knight", then this card's effect will be activated because it was destroyed by a card effect.

Blast with Chain: If a monster attacks "Gearfried the Iron Knight", and you activate "Blast with Chain" during the Damage Step, "Blast with Chain" is destroyed and gets its effect, so you can destroy the attacking monster before Damage Calculation.

Butterfly Dagger - Elma:" While "Morale Boost" is active, if you equip "Butterfly Dagger - Elma" to "Gearfried the Iron Knight", 1) Increase your Life Points for "Morale Boost", 2) destroy "Butterfly Dagger - Elma" with "Gearfried the Iron Knight"s effect, 3) inflict damage for "Morale Boost" when "Butterfly Dagger - Elma" is sent to the Graveyard, 4) the owner of "Butterfly Dagger - Elma" can return it to his/her hand.

Fusion Sword Murasame Blade:" If you equip this card to "Gearfried the Iron Knight" it is not destroyed.

Gearfried the Swordmaster:" If you Tribute 1 "Gearfried the Iron Knight" to activate "Release Restraint", then chain "Serial Spell", you can Special Summon 2 "Gearfried the Swordmaster" cards from your Deck.

Release Restraint:" If you do not have any copies of "Gearfried the Swordmaster" in your hand or Deck, you can still activate this card to Tribute "Gearfried the Iron Knight", but you will need to show your cards to your opponent to confirm.

Smoke Grenade of the Thief:" This card must be destroyed directly for its effect to activate, such as with the effects of "Mystical Space Typhoon", "Heavy Storm", or "Gearfried the Iron Knight". Its effect does NOT activate if the monster it is equipped to is destroyed, Tributed, flipped face-down, or removed from the field.

If you select your opponent's "Gearfried the Iron Knight" with "Snatch Steal", "Snatch Steal" is destroyed when it resolves and "Gearfried the Iron Knight" remains on your opponent's side of the field.The latest errata of "Gearfried the Iron Knight" makes it clear that its effect is a Trigger Effect. This ruling could only be the case if it was a Continuous Effect.