[Sandman]

Some of these I've suggested before:

Trickster's Cap: fire-1, air-1. Halves the fatigue cost of all spells with a path requirement of one. Mid level.

The Stone of Destiny: earth-4, astral-4. Grants a 10-gem bonus when casting globals or dispel, but doesn't decrease the initial gem cost. Unique.

Trinket Hammer: fire-2, earth-2. Allows a mage to forge two level-0 items for the price of one. High level.

Scavenger's ring: fire-2. Greatly increases the chances of finding enemy items after a battle. Mid-level.

Loki's Crown: nature-5. The wearer can cast Transformation at no cost and no risk.