When does When I hold create a chain? After scoring right? And is that in beginning phase?

When "When I hold" abilities create a chain, it occurs during the Beginning Phase, specifically during the Scoring Step.

According to Rule 376.4.c.2.a, "When I hold" abilities are triggered and placed on the chain as pending items after the unit is present at a battlefield when a player maintains control of it and gains 1 Victory Point from Holding during their Beginning Phase.

To clarify the timing:

1. Beginning Phase: The phase begins.
2. Scoring Step: The game checks for "Holding" (maintaining control of a battlefield).
3. Trigger: Once the player maintains control and gains the Victory Point, the "When I hold" ability triggers.
4. Chain: The ability is then placed on the chain as a pending item, creating a chain (if one didn't already exist).

In short: It happens during the Scoring Step of the Beginning Phase, immediately after the Victory Point from holding is gained.