You can fill your graveyard with cards like Stitcher's Supplier or Gravebreaker Lamia, put them on top of your library, and draw the most important of them
you can float the mana from the Forest youre planning on bouncing, then replay it as your land for turn
Ensuring you have the right color mana open in the base precon is going to be your focus every game
When you put counters on an active Nexus via modular, the counters stay on even when the Nexus stops being a creature and will still pump that Nexus the next time you activate it
Death Dealer can kill all minions already setting your opponent back, but now with Sinkhole you can continue to disrupt your opponents mana and threshold
Drawing 2 cards per turn on average would be utterly fantastic, but as long as it averages 1 card it's still good in just about any Mono White deck