Omni
From Archon Arcana - The KeyForge Wiki
The active player can resolve an ”Omni:“ ability during their turn if it on a ready card they control, even if the card with the ”Omni:“ ability does not belong to the active house. Using a card with an “Omni:” ability causes the card to become exhausted.
If a card has multiple “Omni:” and/or “Action:” abilities, only one of them can be resolved each time the card is used.
Related Topics: "Action:" Ability, Using Artifacts, Using Creatures
—KeyForge Master Rulebook v17.4 September 2024
Rulings
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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
I have a stunned Saurian Egg in play. I have chosen a non-Saurian house this turn. Can I use Saurian Egg's Omni: ability to remove the Stun?
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