I have research the cards in the game that seems to modified the Original ATK in some way.
Shield & Sword
Normal Spell
Switch the original ATK and DEF of all face-up monsters on the field until the end of the End Phase. Any additions and subtractions to ATK and DEF due to card effects are applied to the new ATK and DEF. Monsters Summoned after this card's activation are excluded.
Cat's Ear Tribe
Effect Monster (Beast-Warrior / EARTH / 1 Star / ATK 200 / DEF 100)
The original ATK of your opponent's monster(s) that battles with this card during his/her turn becomes 200 points during the Damage Step.
Fusilier Dragon, the Dual-Mode Beast
Effect Monster (Machine / DARK / 7 Stars / ATK 2800 / DEF 2000)
This card can be Normal Summoned or Set without Tribute. In that case, the original ATK/DEF of this card become halved.
Behemoth the King of All Animals
Effect Monster (Beast / EARTH / 7 Stars / ATK 2700 / DEF 1500)
This card can be Normal Summoned or Set with 1 Tribute Monster. In that case, the original ATK of this card becomes 2000. When this card is Tribute Summoned successfully, you can return from your Graveyard to the owner's hand a number of Beast-Type monsters equal to the number of Tributed monsters.
King of the Skull Servants
Effect Monster (Zombie / DARK / 1 Star / ATK ? / DEF 0)
The original ATK of this card becomes the number of "
King of the Skull Servants" and "
Skull Servant" cards in your Graveyard x 1000 points. When this card is destroyed and sent to the Graveyard as a result of battle, remove from play 1 other "
King of the Skull Servants" or "
Skull Servant" card in your Graveyard to Special Summon this card.
Megarock Dragon
Effect Monster (Rock / EARTH / 7 Stars / ATK ? / DEF ?)
This card cannot be Normal Summoned or Set. This card cannot be Special Summoned except by removing from play a Rock-Type monster(s) in your Graveyard. The original ATK and DEF of this card become the number of Rock-Type monsters you removed from play when you Special Summoned this card x 700 points.
Lost Guardian
Effect Monster (Rock / EARTH / 4 Stars / ATK 100 / DEF ?)
The original DEF of this card becomes the number of your Rock-Type monsters that are removed from play x 700 points.
In any case this discussions for now is about how we will now resolve the many situations that can happened in a Duel. The most common will be VS any card that make reference to the Original ATK/DEF.
Megamorph is the one that we have use the most, because of the ruling we already have.
But, What if we are discussing over nothing?, what if we are misunderstanding the phrase "the original ATK/DEF of this card become" as if this effect erase the card ATK "printed", so if that monster goes to the graveyard it should stay changed, for example in the case of Fusilier, if is destroyed the ATK will steal be 1400 when it goes to the graveyard because you used his effect, isn't? (I do know it has no sense). What if there are no way to change the original ATK/DEF, and this cards only refer to a simple way to calculate their ATK/DEF based on their effects?
I remember some one use the example of
Cyber Harpie Lady,
Harpie Lady 1, 2 and 3, as the first card that modified what's printed on the card, (
A Legendary Ocean was actually the first one in that case) but my point here is that we are misunderstanding something here,
Harpie Ladys, and
A Legendary Ocean, does not change the physical structure of the card, this cards have only a continuous Effect that states that this cards are the same as using the one they referee to. But in the case of the cards that modified the original ATK/DEF, this is not the same.
In the case of
Elemental Hero Flame Wingman there are two rules that gives us some guidelines
"¢ The damage inflicted by the effect of "
Elemental Hero Flame Wingman" is based on the ATK of the destroyed monster in the Graveyard. So it's the original ATK of the monster.
It says in the graveyard right?
"¢ If your "
Elemental Hero Flame Wingman" destroys a "
Fusilier Dragon, the Dual-Mode Beast" that was Summoned without Tribute, inflict 1400 damage to your opponent's Life Points.
Its says inflict 1400 damage, so the Original printed ATK gets actually erased? And as I say, because of its effect Fusilier now has 1400 ATK, and if you revived it will have 1400 ATK, don't. Even when this get no sense at all. Something that Fusilier rulings do not states is, what happened if a Fusilier summoned by its effect is destroyed and send to the graveyard, and later revived via
Monster Reborn, or some other effect to the field? This is because it seems to be obvious that his ATK will be 2800, but right now I don't now that for sure. And what happened if you use
Interdimensional Matter Transporter on Fusilier summoned by its effect, that its Effect gets reset? We don't now that for sure. What we know its that there is a big contradiction right now because of one rule on Fusilier that states:
"¢ If you Summoned this card without Tribute, and then "
Skill Drain" is later activated, the ATK and DEF are no longer halved. If "
Skill Drain" is later destroyed, the ATK and DEF still remain 2800/2000.
So the Effect of Fusilier is just an Effect that can get RESET, and so the Original ATK that were halved was never ever even writhed on the card. (My head it's a mess right now.)