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
I have mentioned this card before in some articles, so I am dropping it to Honorable Mention, and it had risen in price a few bucks since I delved into it about 2-3 years ago
If an effect adds additional combat phases to a turn and a creature with a boast ability attacks more than once during that turn, its boast ability can still be activated only once
When this card is Normal Summoned successfully, you can return all cards that were removed from play back to the owner's Decks, and then shuffle your Deck
Vendilion Clique was one staple win condition for control, since you could flash it in, get information from your opponents, and even disrupt combos