Minamo Scrollkeeper, Trusted Advisor, Doctor Octopus, Master Planner, Cecily, Haunted Mage/Eleven, the Mage, and Twenty-Toed Toad each increase your maximum hand size to a specific amount and might fit your deck's plan
The problem with that version of Nicol Bolas is that there are many incentives to take advantage of its special ability with things like Dragon Tempest or Psionic Gift when thats your commander
Scytheclaw Raptor forces players to play at sorcery speed (lest they take four damage per spell), Giant Cindermaw shuts down lifegain, and Kinjallis Sunwing forces foes creatures to enter the battlefield tapped
Saprolings are the perfect sac fodder, perfect chump blockers, and suitable tokens to up your token count
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