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When talking about the actions of a powerful entity, I need an idiom to convey that the effects will be profound.
The only one that is close to this that I can think of is "When a big tree falls, the earth shakes". However, this is not useful for all situations, as this idiom is for when something negative ("falls") happens to that entity.
I just had a "shooting star" going through my head:
When the lion roars everyone listens.
I think it fits you your needs.
I know a French quote that says:
« Le battement d'ailes d'un papillon au Brésil peut-il provoquer une tornade au Texas ? » Edward Lorenz
I translated it into English for you:
« The flapping of a butterfly's wings in Brazil can provoke a tornado in Texas »
If you want, you can read more about the Butterfly effect. One quote from there says:
One meteorologist remarked that if the theory were correct, one flap of a sea gull's wings would be enough to alter the course of the weather forever. The controversy has not yet been settled, but the most recent evidence seems to favor the sea gulls.
