Focus Effect: Exchange

The exchange effect replaces blocks with other blocks that are in your inventory. By sneak-clicking the target block (granite, for example), and then clicking other blocks (such as stone), you will replace the stone with granite and put Cobblestone into your inventory. This will work only if you have enough blocks in your inventory:

You can add Silk Touch and Fortune. Using this on ores could be very beneficial since you do not need to enchant a pickaxe: