The beauty of the new Muldrotha, The Gravetide as both a Showcase and Fracture Foil card, along with its excellent playmaking capability, make it one of the best cards in the MTG: Foundations release
Canoptek Tomb Sentinel has an ability that will trigger when it comes into play from your graveyard, exiling a nonland permanent
Auras are one of the best ways to grow the Champion, since they'll make it an insurmountable threat on top of the +1/+1 counters
See rules 613.2, 707.2, and 707.3
All your mounts and vehicles gain haste with Kolodin out in play, letting them attack the turn they come down, assuming you can crew the vehicles
Packing 1K boxes full to the brim should prevent any movement, and boxes that only have a few hundred cards should be filled with some other sort of filler to prevent them from moving around