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); replacement is considered breaking the original block and placing down the substitute block, so the block will be "broken" unless the focus is upgraded with Silk Touch. This range can be extended by modifying the focus using a Focal Manipulator. Each block transformed costs 0.05 + 0.05  +0.05.

Upgrades

 * Frugal: Reduces the vis cost of activating the focus's powers by 10% per level.
 * Enlarge: Increase the area that can be changed at once by Equal Trade.
 * Architect: Allows the player to select the area and dimensions affected by the focus.  will change the dimensions altered and   will extend the affected area by 2 blocks in the dimensions selected. Pressing   at the maximum area will reset it back to 1x1.
 * Silk Touch: Blocks being replaced are not broken when placed in the player's inventory.