Mischief

2nd-Level Illusion
Casting Time: 1 action
Range: 60 feet
Components: SM (a piece of crust from an apple pie)
Duration: (C) 1 minute

As in Fizban's Treasury of Dragons with the following added:

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the size of the cube increases by 5 feet for each slot level above 2nd.

Source: FTD 20

Changelog

Added upcasting option.