For example, if Sandman is blocked by a creature with 4 power, and then an effect gives that creature -3/-0, it won't stop blocking Sandman
While I won't go into detail regarding the choices of the list, I did want to share another design that I do think could use Helm well, and perhaps more efficiently
Its built around the ability to mill your own library, moving cards from your deck into your graveyard to then either bring them back to life, activate other abilities, or both
Magewrights Stone is an integral piece of the strategy for adding these cards
The Growing Threat March of the Machine Commander Deck set includes 1 ready-to-play White-Black deck of 100 Magic cards (2 Traditional Foil Legendary cards, 98 nonfoil cards), 10 Planechase cards, 1 six-sided planar die, a 2-card Collector Booster Sample Pack (contains 1 Traditional Foil or nonfoil special treatment card of rarity Rare or higher and 1 Traditional Foil special treatment Common or Uncommon card), 1 Foil-Etched Display Commander (a thick cardstock copy of the commander card with foil etched into the cards border and art), 10 double-sided tokens, 1 deck box (can hold 100 sleeved cards), 1 Life Wheel, 1 strategy insert, and 1 reference card.