Xavi Hernandez

The rationale behind Rakitic's purchase was simple; he was to provide the work-rate and dynamism not possible for the aging, battle-hardened limbs of Xavi. It has certainly worked too.
While this may have heralded the rise of Bayern - although it's worth remembering they reached the final in 2010 and 2012, so it's not exactly as though they've suddenly came from nowhere to usurp Barca's throne - it was not necessarily the 'end' of Barcelona.
Spain's triumph at Euro 2012, becoming the first team to win three consecutive international tournaments, was not only based on technical excellence, tactical flexibility and a desire for repeated success.