heaven-sent 
adjective
Occurring at a very favourable time; very opportune: she was so afraid of losing this heaven-sent opportunity...
- Self-assessment would also provide a heaven-sent opportunity to rid the nation of estate agents, while increasing our wealth.
- And why didn't any of your recent career-reviews by the big-name analysts of the game even mention the innumerable times you squandered a heaven-sent opportunity to carry India to victory?
- He said: ‘This is a heaven-sent opportunity to continue serving the community.’
Synonyms
auspicious, providential, propitious, felicitous, opportune, golden, favourable, advantageous, serendipitous, lucky, happy, good, right, fortunate, timely, well timed