Worldbuilding

Just being able to arbitrary shrink/expand or teleport objects would have massive repercussions on how building material gets transported. For something like an eleven-story tower, instead of building one floor at a time, craftsmen would work on all floors simultaneously and finish the tower by shrinking/teleporting each constructed floor on top of one another. It would also have massive repercussions on how urban centers are designed. For example, waste management would look very different if you could just shrink waste down to an arbitrary size and teleport the shrunken waste to the center of the Sun. Piles of waste material like sawdust or tailings could be shrunken into a manageable size and teleported into a cavity of a giant cube made out of a magical durable material like adamantium. Once the shrink spell wears off, the waste pile would try to expand back to its normal size, but since it's stuck in a cavity of a magical material that refuses to budge, the waste pile would forcefully compress itself until it's an ultradense block with the exact dimensions as the cavity. The ultradense block could be teleported out of the cube and used as building material.