Revisiting Standard Rotation
THE ISSUE
Beginning in 2016, the First Set of Each Block (the Fall and Spring Sets) Will Cause a Rotation...
THE STANDARD SOLUTION
Wizard's is going to return to a once-yearly rotation cycle, where Standard rotates a year's worth of sets (in this case, two blocks) with the second large set of the year (the Northern Hemisphere fall set). This rotation will be implemented immediately with Kaladesh and going forward.
That means Kaladesh will be legal for two years instead of 18 months, and will rotate out of Standard with the release of the second large set in 2018. Aether Revolt will rotate out with Kaladesh. Meanwhile, there will be no rotation when Amonkhet releases in April 2017.
Find out the full story straight from Wizards.
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