This was how mine ended 
The rocks from timber were actually useful for drawing enemy attacks
I got all 4 kills with Blacktitan’s entrance. I cannibalised Timberlord at the start to get both Zephyrin and Blacktitan on the field. Then chained together some pull back from Onigeist and retreat + switch places to get the passive entrance multiple times. Baby summon was necessary to get some extra stun in and I think I used Blacktitan’s retreat to get the baby into the battle so it could stun burst.
For me, cannibalizing timberlord killed the first one, retreat and switch places killed the second one, onigeist helped kill the third one, and switch friend into switch places killed Deus x as the last one.
That’s probably how I did it except it took me and hour lol
I thought it was a really fun puzzle. Took me 2 tries to figure out what was going on lol.
Then took me 1 more try cuz I screwed up and didn’t give myself enough chances to bring blacktitan back in.
All in all the puzzles were really fun this time albeit a little simple.
The last one was a bit tricky. Took me like 5 attempts until I figured out how to beat it. Its as well very good to learn new presented legendaries to work with their mechanics. Even it might motivate some people to go for that egg maybe 
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