In 2014, LEGO released 2 Castle sets across 2 subthemes, all of these sets have been retired. Subthemes for that year included Dragon Knights and Lion Knights. For that year, the total price of all retail sets cost $30, today those sets are valued around $235, a growth of 684%.
Most valuable 2014 LEGO Castle set
850889 Castle Dragons Accessory Set $122.87
Most owned 2014 Castle set
850888 Castle Knights Accessory Set
2 sets

850888 Castle Knights Accessory Set

Theme / Subtheme Castle / Lion Knights
Year 2014
Pieces / Minifigs 32 / 4
Availability Retired
850888 LEGO Lion Knights Castle Knights Accessory Set
Retail $14.99
Value $112.19
Growth  +648.4%
Annual growth 11.5%

850889 Castle Dragons Accessory Set

Theme / Subtheme Castle / Dragon Knights
Year 2014
Pieces / Minifigs 42 / 4
Availability Retired
850889 LEGO Dragon Knights Castle Dragons Accessory Set
Retail $14.99
Value $122.87
Growth  +719.7%
Annual growth 12.5%