Solomon Muto first appeared in the original series of Yu-Gi-Oh! He owns a game shop and he's the grandfather of Yugi Muto. Solomon Muto is the one who gave the Millennium Necklace to Yugi Muto. He also made several appearances in Yu-Gi-Oh! GX.
That was Gozabura Kaiba's ace though. What about when they add him and Noah. I mean F***ing Espa Roba got in somehow so they will probably eventually get around to Season 3 characters (waits eagerly for Seal of Orichalcos before the extra deck becomes to important to exclude from the meta).
They only added Espa Roba because of Jinzo being such a popular card. Also, at least Espa Roba is a unique and somewhat fun character, whereas I'm really not sure what they'd be able to do with Solomon. Maybe if they just added Solomon as an NPC that you can buy cards from, kinda like the card trader but have him trade Legendary Duelist drops instead. That would be pretty cool.
If he had been unlockable, we would have gotten his Exodia cards without using the skill Granpa’s cards. Wait a minute if we put Exodia into Yugi’s deck with Granpa’s cards skill, then he would have 2 sets of Exodia!
Not as a standalone card, however, preventing it from being the Glossy in his Starter Deck. I guess them actually using Exodia for that but making the limbs not obtainable wouldn't be horribly overpowered, but I'd still expect a card like BEWD, Legendary Exodia Incarnate, Exxod or even Guardian Sphinx over it.
Skill at stage 4:Too old to play
Makes your turn go second
Skill at stage 6:Heart of the cards
You draw at least one Super Rare card and start with 4500 LP
Skill at Stage 8:Grandpa’s cards
Starts with an Exodia care in the hand
Skill at stage 10:Puzzle Solver
Knows what cards are face Down and drawn by the opponent
Stage 14:Game shop
Starts with the field spell ‘Game shop’ that increases ATK points of all Spellcaster and Fairy types by 200 points.