What is the sixth layer when dealing with continuous effects?

The sixth layer in the sequence of continuous effects in Magic: The Gathering pertains specifically to ability-adding and ability-removing effects. This layer is significant because it operates after the previous layers that address aspects such as power, toughness, control, and card type, ensuring that any abilities that are added to or removed from a permanent can then function correctly.

Understanding the layers of continuous effects is crucial for determining how multiple effects interact with one another. In layer six, the game's rules clearly state that any alterations made to a creature's abilities happen once its power, toughness, type, and control have already been established. This means that abilities are added or removed from a permanent without disturbing the previously resolved attributes.

For example, if a creature has its power boosted and also gains a new ability from an effect, the new ability is effective starting from its resolution, while the previously established power changes remain intact. This is why it’s critical to grasp the sequence; any misunderstandings can lead to incorrect gameplay conclusions, affecting which abilities apply and how creatures perform in various situations.

Thus, the choice regarding ability-adding and ability-removing effects being the sixth layer is correct due to its foundational role in the hierarchy of continuous effects, ensuring that abilities function accurately