Official Rulings
If I play Mug (COTA 244) and resolve its “Play:” ability, do I have to choose a creature with Æmber on it?
No. You may resolve Mug’s “Play:” ability on any creature. If there is Æmber on the creature, move 1 Æmber to your pool and then deal 2 damage to the creature. If there is no Æmber on the creature, resolve as much as you can, and just deal 2 damage to the creature.
Source: Rulebook
If I play Mug (COTA 244) and resolve its “Play:” ability, do I have to choose a creature with Æmber on it?
No. You may resolve Mug’s “Play:” ability on any creature. If there is Æmber on the creature, move 1 Æmber to your pool and then deal 2 damage to the creature. If there is no Æmber on the creature, resolve as much as you can, and just deal 2 damage to the creature.
Source: Rulebook
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