Static Orb only alters your own untap step. While you untap all your artifacts during other player's untap steps with Unwinding Clock it is not actually your own untap step so it is unaffected. You'll untap all artifacts.
Edit: Also I wanted to add that if you have Static Orb tapped for whatever reason going into someone else's turn they will be able to untap like normal. During the untap step all permanents are untapped simultaneously so at the same time all your own artifacts are untapped (including Static Orb) the player whose untap step it is will untap all their permanents.
During your own untap step, you cannot untap more than two permanents. During each other player's untap step, you get to untap all your artifacts. Notice the "during their untap steps" wording on the Orb. This means, that the Orb applies only during that players untap step and only to that player alone. notice the "each other player's" wording on the Clock. This means, that it applies only during other player's turns. There is no interaction between these two cards since they don't apply during the same turn.
So if you have five artifacts, during your turn, you cannot untap more than two. During each other player's untap step, you untap all of them.
Unwinding Clock
How do these cards interact? H ow many artifacts do I untap if I have 5 artifacts?
Edit: Also I wanted to add that if you have Static Orb tapped for whatever reason going into someone else's turn they will be able to untap like normal. During the untap step all permanents are untapped simultaneously so at the same time all your own artifacts are untapped (including Static Orb) the player whose untap step it is will untap all their permanents.
So if you have five artifacts, during your turn, you cannot untap more than two. During each other player's untap step, you untap all of them.
Former Rules Advisor
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