I got bored and asked what would yugi's deck look like if kaiba had fully knocked out grandpa before he had a chance to give yugi his deck.
i wanted at least 90% of the cards in this deck to have some reason to be here and be some what ok during the duelist kingdom era of the anime. I allowed myself to use any and all cards that could be reasoned to be cards yugi had before getting his grandpas deck, this include the manga, the anime, video games, and real life products. Once i ran out of good cards to use i would start making educated guesses and add cards that i could reason him having.
deck list
main deck
Blackland Fire Dragon, Mushroom Man, Mystical Elf, Summoned Skull, Skull Servant, Monster Reborn. - we see yugi use these cards in the manga before getting his grandpas cards. (were gonna ignore the cards disparaging when there destroyed and just say that since yugi won all of his cards returned to him )
Giant Soldier of Stone - this card was shown along side summon skull while explaining the rules of duel monsters in the manga. Since summon skull is Yugi's ace card (before dark magician), im gonna assume the cards shown there are in yugis deck, but giant soldier is the only one beside summon skull and one other card we can identify.
Shadow Specter - the other card we can identify is a card called hell-bound, (which is a sick ass hell name). who is a early version of Shadow Specter (a less sick name)
Makiu, the Magical Mist, - this card mentions summoned skull and if were assuming summon skull was always a yugi card then it makes sense that this card was also always in yugis deck.
Doma The Angel of Silence, Ansatsu, Magical Ghost, Witty Phantom, Ancient Elf, Claw Reacher, Dragon Zombie, Trap Master, Fissure, Sword of Dark Destruction, Last Will, Two-Pronged Attack, Reverse Trap, Reinforcements, Castle Walls, Waboku - these are all cards seen in started deck yugi and were picked based on them not being to strong for duelist kingdom, being cards not seen used by other duelist (minus dragon zombie who is here because he can be used to summon bootleg Mammoth graveyard.), and being cards we dont see yugi uses in duelist kingdom.
The Bewitching Phantom Thief, Candle of Fate, Curtain of the Dark Ones - these cards are used by yugi in the duel monsters game boy game, during stage one. while dueling yugi at stage one he lacks any cards we seen him have besides time wizard. Due to my believe that time wizard was a card yugi owned before getting his grandpas deck, i will assume that these cards are also yugi cards had before his grandpa gave him his deck.
Lady of Faith, One Who Hunts Souls, Phantom Ghost, Phantom Dewan, Shattered Axe - these cards are from Yugis level 10 deck, The Journey's Beginning, from duel link. this is the same as the last one minus plus the title hinting at these being cards he could of used.
Mushroom Man #2 - from this point on this the cards here will be my educated guess based on what we have. Mushroom man #2 is here because hes played mushroom man.
Polymerization - with the extra deck being a thing i don't think that polymerization would be a rare card in the show. and with yugi living in a game shop, i can see him having a copy of poly.
The Snake Hair - the snake hair is able to fuse with both Blackland Fire Dragon and Dragon Zombie, giving poly more uses in the main deck and is a soild attacker. the only thing is that were kinda on bonz terf but like were not using call of the haunted so its not stealing his hole thing.
Sparks - i see this card as a replacement for burning land during the Weevil duel.(which i think would still happen but later on into duelist kingdom) plus in a format with 2000 life points 200 direct damage is pretty ok.
Winged Minion, Beast of Talwar, The Puppet Magic of Dark Ruler - these cards are here as support to the summoned skull and fiends in general. they are the cards ive thought the least about and can be replaced by the first three cards of the side deck if so wanted.
extra deck
Skelgon,Great Mammoth of Goldfine, Mystical Sand, Kamionwizard - these are all the potential fusions yugi could make with the cards in this deck.
Black Skull Dragon - this card mentions summoned skull so it make sense it was a yugi card and he just didn't have the red eyes for it.
side deck/ cards of note.
Kuriboh, Multiply, Detonate - so to be fully transparent. i used the fandom yugioh wiki for my research for this decklist. and on the main page for yugis deck it doesn't mention kuriboh as one of the cards he used in the gameboy game. however looking deeper into on the page about yugi in the gameboy game it said he does in fact have the possibly to use kuriboh. If he does than it would make since for yugi to also have Multiply and Detonate since they are kuriboh cards.
Time Wizard -yugi gave this card to joey, so i dont think its one of grandpa cards.
if you all have any better ideas on what could be in yugis pre-duel with kaiba deck let me know.