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 685%.
Most valuable 2014 LEGO Castle set
850889 Castle Dragons Accessory Set $124.99
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 $110.32
Growth  +636.0%
Annual growth 11.6%

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 $124.99
Growth  +733.8%
Annual growth 12.6%