on Pocket Universe when Commentary
When an artifact with Æmber on it leaves play, the Æmber is returned to the common pool.
Source: Leaves Play
If there is enough Æmber on this card (or other cards with this effect under the control of the active player) combined with the Æmber in the active player's Æmber pool during the "Forge a Key" step, the active player must forge a key.
Source: Forge
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