mtg background cards rules How do commander and partner rules interact with Background enchantment?

1 Isshin, Two Heavens as One

These Incarnation creatures deliver supremely powerful abilities and eminently flavorful designs to Magic: The Gathering.

On Zendikar, danger is the norm: wild terrain, cunning predators, and "the Roil"violent ripples of changeall make life precarious and full of adventure

Whenever you scry, your next instant or sorcery spell you cast this turn costs less to cast, where X is the number of cards looked at while scrying this way

Spend this mana only to cast a planeswalker spell." [-3]: You draw X cards and Commodore Guff deals X damage to each opponent, where X is the number of planeswalkers you control