Simply Transmogrification

Overview

This mod enables exchanging a quantity of items for different items.  First you need to craft a Hobbesian Talisman:

Everything else is crafting recipes that include the talisman (which does not get consumed):

4 iron <-> 1 ender pearl

8 iron <-> 1 gold ingot

4 gold <-> 1 diamond

2 diamonds <-> 1 emerald

Also, logs and saplings can be exchanged in a loop:

oak->spruce->birch->jungle->acacia->dark oak->oak