Build a tower with at least 12 Wizard-created objects and stand on top of the tower without collapsing it.
Silver Trophy

This one can be tricky; you need to have your Wizard fully upgraded so you can build 4 blocks and have 4 planks out at the same time, you will also need the Blue Masterstone found in level 8, the Red Masterstone found in level 11 and Wolfgang's Music Box found in level 13. I suggest the beginning of Fangle Forest to do this since the checkpoint at the beginning of the level will refill your magic but it can be done on any level once those items are in your Wizard's inventory