Jin-Gitaxias // The Great Synthesis Commander deck

Ward {2} Whenever you cast a noncreature spell with mana value 3 or greater, draw a card. {3}{U}: Exile Jin-Gitaxias, then return it to the battlefield transformed under its owner's control. Activate only as a sorcery and only if you have seven or more cards in hand. // (As this Saga enters and after your draw step, add a lore counter.) I — Draw cards equal to the number of cards in your hand. You have no maximum hand size for as long as you control this Saga. II — Return all non-Phyrexian creatures to their owners' hands. III — You may cast any number of spells from your hand without paying their mana costs. Exile this Saga, then return it to the battlefield (front face up).

Based on 6 real Jin-Gitaxias decks and 12 similar commanders.