Tournament of Elements was based on the fourth season of Ninjago: Masters of Spinjitzu and the theme is based on the ninjas against Anacondrai Cultists and Master Chen. The sets focused on ninja vehicles, Anacondrai warrior vehicles, and Chen's Island locations. Because the wave included two suits for each ninja instead of one, most of the ninja minifigures were exclusive to one set at the time of this wave's release.
Tournament of Elements was introduced in 2015 and currently consists of 14 sets. As of today,
70750 Ninja DB X is the most valuable Tournament of Elements set with an estimated new/factory sealed value of $238.
Summary
Ninjago Tournament of Elements Anacondrai Battle Mech set 30291 was released in January 2015, retailing for $4, but has since been retired. New, unopened Anacondrai Battle Mech sets are valued at $9, while used sets can be found for $5 in good condition.
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