Effects that put cards into a player's graveyard from anywhere else do not cause those cards to be discarded
As announced, the four commanders are Terra, Cloud, Tidus, and Yshtola, so you can expect decks inspired by Final Fantasy VI , Final Fantasy VII , Final Fantasy X, and Final Fantasy XIV
Neither player can get much benefit from any land beyond the sixth or seventh
Brass's Tunnel-Grinder / Tecutlan, the Searing Rift Brass's Tunnel-Grinder is a good rummage that requires you to descend for three turns straight, but the grind is worth it because Tecutlan, the Searing Rift turns one spell per turn into a second full card
Yawgmoth, Thran Physician Powerful enough to create its own Modern archetype, Yawgmoth, Thran Physician combines removal, card draw, and combo potential in a single card
Then return it to play by sacrificing your Food