Stun
When a creature becomes stunned, place a stun counter on it. While a creature is stunned, it cannot fight, reap, or use Action: or Omni: abilities.
Any time a stunned creature could normally be used, it can instead be used by exhausting it to remove its stun counter.
If a card effect would cause a stunned creature to fight, reap, or use an Action: or Omni: ability, instead that creature is exhausted and the stun counter is removed. This is considered “using” that creature.
Constant abilities and abilities that do not require the creature to reap, fight, or be used are still active.
If a card effect would cause a stunned creature to be used for any reason, instead that creature is exhausted and the stun counter is removed. This is considered “using” that creature.
While a creature is stunned, it cannot have another stun counter placed on it. If an effect attempts to stun a stunned creature that effect does not stun the already stunned creature.
If a card ability instructs a player to unstun a creature, each stun counter on the creature is removed.
Note: The original Call of the Archons starter set used stunned cards instead of cardboard counters. These cards are used exactly like stunned status counters.
Related Topic: Using Creatures
Rulings
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You can unstun a creature anytime it could normally be used, whether because it belongs to the Active house or because a card effect allows you to use it.Source: Rulebook
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Yes, an Omni: ability lets you use the creature outside of the Active house, which will allow you to remove the Stun from the creature.Source: Rulebook