Wand Focus: Equal Trade (Thaumcraft 4)

Wand Focus: Equal Trade is a wand focus added by Thaumcraft 4. It is used to switch out blocks in the world with blocks in the player's inventory. Shift right-clicking on a block with it equipped will attune the focus to the block, making it the substitute block. Left-clicking on another block will replace it with the substitute block. Right-clicking will transform an a 7x7 area of blocks that the player can see (the focus will not affect blocks behind those). This range can be extended by modifying the focus using a Focal Manipulator. Each block transformed costs 0.05 + 0.05  +0.05.