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The Lava was obtainable in Season 13: "Become a Supervillain" by reaching level 8.
Supply is widely distributed — no single holder owns enough to register as a hoarder.
Lava's current MU count is at ~173, which is similar to most other rare items (such as Beachball or Live2020), and even lower than some rare items (such as Star Wing which is at ~206), despite Lava being at uncommon.