Backgrounds, for instance, are a new type of enchantment, and will help represent your commanders story so far and give them a bonus
Both of these cards wont help once cards reach our hands, but having the ability to manipulate the top of our library as effectively as these cards do makes them a better fit than even my first budget optionHedron Alignment
Each of them has around 50 new cards as well as nice reprints, so you cant be wrong about picking one of these
It also has an activated ability where it can exile target card from a graveyard, and if it happens to be a creature you get to make a Pest token
Using cards like Windfall and Jaces Archivist after stacking opponents hands with Forced Fruition and Font of Mythos feels like this could be an interesting take on a non-mill mill deck, decimating opponents libraries and then hitting them in the skies with a stacked hand that you keep stacked thanks to Reliquary Tower, Body of Knowledge, Thought Vessel, and Decanter of Endless Water