But here, you can complete it by spending just over 300 mana, or even less. The initial mana boost from the Pandora's Box is quite significant. =)
Marlo_Stanfield, excellent tactic! The Chinese players didn't come up with that. And the assumption about the earthquake bug is correct: https://imgur.com/a/QxUJs
In total: 1 solution has been found. 1 new solution has been proposed. There are 2 remaining to be solved (one is complex with 2 variations, and 1 is easy and long, although it might not be very long; I have an idea for it).