In the effect that makes all noncreature artifacts become 2/2 artifact creatures, what types of effects are being applied?

The correct answer highlights the nature of how the effect transforms noncreature artifacts into creatures. Specifically, it involves both a type-changing effect and a power- and toughness-setting effect.

When the effect makes all noncreature artifacts into 2/2 artifact creatures, it alters their card types from noncreature artifacts to creatures. This is a type-changing effect because it changes the fundamental type of the objects on the battlefield. Specifically, it assigns them the creature type, which means they will now be treated as creatures by game rules.

Additionally, the effect specifies a power and toughness of 2/2. This is a power- and toughness-setting effect since it defines how strong (power) and resilient (toughness) these newly minted creatures will be during gameplay. It’s essential for understanding interactions related to combat and other effects that interact with the power and toughness of creatures.

By recognizing these two components—changing the type to creature and specifying power and toughness—one can accurately understand how this effect operates in the game. Other interpretations, such as control-changing or ability-adding effects, do not apply in this context, as they relate to different aspects of card interactions.