If the champions league is mentioned always there is the set of fans that do not basically rate the Real Madrid team winning the champions league they always go ahead to this mode that the club is lucky. Although in liked there is always luck but someone does something repeatedly isn’t supposed to be classified as luck again but perfect of the master craft.
Those people who assume Real Madrid was just lucky in UCL, they must never learn the stats and probably just know football. Or they are haters of Real Madrid. 
It is clear that Real Madrid is very dominating UCL and it is not only abut luck. They won most trophies, and they won't almost all UCL finals. There are no other teams which can do this. It is proven that Real Madrid is a special team in UCL. It is normal if Real Madrid becomes the candidate of the champion in every season.
...Well, If it's about stats then they won't have qualified at some point, I'm not really concerned about their previous UCL trophies but let's take a look at last year's game ( If truly you want to judge by stats then check their stats).At the same time I'm not insinuating that most/all their games are based
luck rather I'm just saying they do have the luck sometimes amd this falls at the last minutes
. Earning that amount of trophy isn't actually a easy one, they really deserved it.