That depends on which one has the later timestamp, i.e., which one entered the battlefield last.
113.10c If two or more effects add and remove the same ability, in general the most recent one prevails. See rule 613 for more information about the interaction of continuous effects.
my understanding of backgrounds is they some how are "layering" these abilities onto the commander creature, so humility cannot erase them???
Effects that add or remove abilities are applied in layer 6, and timestamp order determines the final result.
613.1f Layer 6: Ability-adding effects, keyword counters, ability-removing effects, and effects that say an object can’t have an ability are applied.
613.3. Within layers 2–6, apply effects from characteristic-defining abilities first (see rule 604.3), then all other effects in timestamp order (see rule 613.7). Note that dependency may alter the order in which effects are applied within a layer. (See rule 613.8.)
613.7a A continuous effect generated by a static ability has the same timestamp as the object the static ability is on, or the timestamp of the effect that created the ability, whichever is later. If the effect that created the ability has the later timestamp and the object the ability is on receives a new timestamp, each continuous effect generated by static abilities of that object receives a new timestamp as well, but the relative order of those timestamps remains the same.
Example: Rune of Flight is an Aura that grants enchanted Equipment “Equipped creature has flying.” A player attaches Rune of Flight to Colossus Hammer, an Equipment with “Equipped creature gets +10/+10 and loses flying.” The ability granted by Rune of Flight shares Rune of Flight’s timestamp because it is later than Colossus Hammer’s timestamp. If Colossus Hammer becomes attached to a creature, both of its abilities receive new timestamps (see rule 613.7e), but the relative order of those timestamps remains the same.
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Why bother with mere rulings when so many answers can be found in the Rules?
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I started running background enchantments in one of my commander decks, that runs humility
if I have Agent of the Shadow Thieves out along with humility will my 1/1 commander still have the agent of the shadow thieves ability?
my understanding of backgrounds is they some how are "layering" these abilities onto the commander creature, so humility cannot erase them???
That depends on which one has the later timestamp, i.e., which one entered the battlefield last.
Effects that add or remove abilities are applied in layer 6, and timestamp order determines the final result.