Building Soundwave, Sonic Spy as your Commander can be done, it just needs a strong focus on token Creatures, forsaking the midrange and control aspects that white, blue and black decks are well known for
But The Lord of the Rings: Tales of Middle-earth immediately enthralled me, with its re-interpretation of Tolkien lore and its aforementioned artwork
You can have more, but I recommend sticking as close to 40 cards as possible while aiming for a ratio of 24 playable cards to 16 lands, adjusting for your curve as you see fit
So, the Gateway Box basically holds your hand through the first round by controlling the first seven cards that come into your hand
That lifelink counter though, slapped on an eldrazi means substantial gains for the -1 ability
If the target creature is an illegal target as Eriette's Lullaby tries to resolve, it won't resolve and none of its effects will happen