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
Clever Impersonator costs 1 more mana than the Metamorph, requires UU in the casting cost when Metamorph needs no colored mana at all, isn't an artifact which makes it harder to tutor up in Blue (artifacts can be fetched with Fabricate and Tezzeret the Seeker), but the upside is that it can also copy enchantments and planeswalkers
Staying Power: This enchantment has a static ability that prevents creatures from being turned face up, a humorous twist on the concept of "staying" face down
Into The Inkland Products Preview With Into The Inklands being the third main set entry, you'll be able to get your hands on cards from Booster Boxes, Illuminere Troves, Starter Decks and Booster Packs