Zhonyas Paradox

With Zhonyas Paradox are you not able to purchase it if you start with the stopwatch or is it only if an Ornn is in the game? Played a few games as Morgana and can't find any information on how to purchase it, seems Zhonyas is as far as the build goes. Yeah I'm pretty fresh back at playing League after an extended break so not really up to date with items etc.
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