Can I resolve Stupefy and add more reactions before Brynhir's ability triggers?

An opponent casts Brynhir. The defending player wants to cast Stupefy in response, draw a card, and add more reactions before Brynhir's when you play me ability resolves.

If my opponent plays Brynhir, can I resolve Stupefy, draw, and add more reactions before Brynhir's ability triggers?

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Can I resolve Stupefy and add more reactions before Brynhir's ability triggers?

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