How about a scaling mechanic that cares about how many spells you've cast this turn
Drop this turn two, tap on turns 3-5 for mana and then on turn 5 you get a 3/3 to swing
Galadriel's Dismissal functions like a split card since you get all the benefits of the hyper-efficient spell that protects a single creature without needing to worry about your protection spell failing the rest of the board
Call of Duty , for example, frequently does cross-promotion with brands like Papa Johns and Mountain Dew
Then, thanks to Moana, Born Leader, the deck also shows you the value of having the majority of your characters at a Location
For the fixing lands, the most important thing they can do is provide multiple colors of mana while being untapped as often as possible