So Shiny — ruling 1

So Shiny's triggered ability checks whether you control a token after it enters the battlefield to see if it triggers. If you don't, the ability won't trigger at all. The ability will check again as it tries to resolve. If you don't control a token at that time, the ability won't do anything. It doesn't have to be the same token for each check, however.

So Shiny — ruling 2

If So Shiny is itself a token, its enters-the-battlefield ability will trigger.

So Shiny : règles, fonctionnement et interactions (MTG)

So Shiny is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Enchant creature When this Aura enters, if you control a token, tap enchanted creature, then scry 2. Enchanted creature doesn't untap during its controller's untap step.

How it works : So Shiny

Original English text — Wizards of the Coast / Scryfall

#1June 18, 2021· Wizards of the Coast
So Shiny's triggered ability checks whether you control a token after it enters the battlefield to see if it triggers. If you don't, the ability won't trigger at all. The ability will check again as it tries to resolve. If you don't control a token at that time, the ability won't do anything. It doesn't have to be the same token for each check, however.
No other card is named in this ruling.
#2June 18, 2021· Wizards of the Coast
If So Shiny is itself a token, its enters-the-battlefield ability will trigger.
No other card is named in this ruling.