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I copy the ability with Rings of brighthearth.
The stack is:
Copy
Ability.
Copy resolves, making 3 goblins.
Original ability resolves, making:
a) 3 goblins. X is determined when put on the stack.
b) 6 goblins. X is determined on resolution.
c) other?
You get 6 goblins, giving you a total of 12 on the field (11 tokens and one Krenko).