Æmber
Æmber is the basic currency in the game and is tracked with Æmber tokens. It is often represented in rules text with this symbol: 
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Only Æmber in your own Æmber pool is considered “yours” for the purpose of card effects.
Gain: When you “gain” Æmber, you take the specified amount from the common supply and add it to your Æmber pool.
Capture: When you “capture” Æmber, you take the specified amount of Æmber from your opponent’s Æmber pool and place it on a friendly creature. Unless otherwise specified, the captured Æmber must be placed on the creature with the capture ability. Captured Æmber is not part of any Æmber pool. When a creature you control leaves play, any Æmber on it is moved to your opponent’s Æmber pool.
Lose: When you “lose” Æmber, you remove the specified amount from your Æmber pool and place it in the common supply.
Pay: When you “pay” Æmber to your opponent, you remove the specified amount of Æmber from your Æmber pool and add it to your opponent’s Æmber pool. If an ability instructs a player to pay an opponent “in order to” perform an instruction, the entire amount must be paid.
Spend: You only “spend” Æmber to forge keys. When you spend Æmber, you remove the required amount from your Æmber pool and place it in the common supply.
Steal: When you “steal” Æmber, you take the specified amount of Æmber from your opponent’s Æmber pool and add it to your Æmber pool.
Related Topics: Capture, Steal