Behold the Multiverse replacing Ray of Command to fall in-line with blue's theme in the cube of card draw, replacing the creature-control.

Fleshbag Marauder replacing Bone Picker to more-align with sacrificing creatures instead of having a payoff for creatures dying.

Kazandu Stomper replacing Citanul Woodreaders because green's theme in the cube isn't card draw. Kazandu Stomper allows sacrificing/reuse of lands that synergies with other cards.

Haunted Cloak replacing Signpost Scarecrow because it promotes combat and board presence over color filtering (which is what lands should do in the cube).

Raiders' Karve replacing Spare Supplies because it promotes combat and board presence.