Seal of Orichalcos

[Azphreal]

Here it is; the card that cannot be killed, the unfair advantage incarnate.

My best effect interpretation, without it being completely unreadable.

 

 

This card cannot be destroyed, and another Field Spell Card cannot be played while this card is face-up. All monsters you control are treated as DARK Fiend-Type monsters in addition to their original Attribute and Type. All monsters you control gain 500 ATK. Also, you can Summon Monster Cards in your Spell and Trap Card Zone while you control this card. Monsters in the Spell and Trap Card Zone cannot be declared an attack target, unless there are no monsters in your Monster Card Zone. However, monsters in the Spell and Trap Card Zone can still attack your opponent. Monsters in the Spell and Trap Card Zone are still treated as Monster Cards. The loser of this duel forfeits their soul.

[Shizuku Oikawa]

Doesn't this go to a different thread?

[Azphreal]

It might, but it only appears in the YuGiOh! anime, so it would be pop culture, considering this is based off something from anime?

[PeterClarke]

that that card noooooooooooooo its taking my souuuuuuuuuulllllllll

lovin it 10/10

[Shizuku Oikawa]

Somehow I keep thinking that Konami already released one of these as a promotional card before.

Update: found 1 with this effect.

Lore:

This Spell Card is impervious to negation, destruction, and removal. Increase the ATK power of all your monsters by 500. You can control a back row of monsters that cannot be attacked while a monster is in the front row. Send this card from your hand to the Graveyard to negate and destroy any card. The soul of whichever Duelist loses this Duel is forfeit to the winner.

 

There have 3 fan-made Seals already in the realistic cards thread

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9.5/10 if it helps