After beating the first league, which probably took me about an hour, I decided to stop playing for the day and go to sleep
Jadelight is a massive boost to the consistency of green and makes a great cube addition
The main way to do so is via the Rob Lucci Character card from Awakening of the New Era [OP-05]
Book of Life allows you to special summon a Zombie monster from your graveyard, while also banishing a monster from your opponents graveyard
Type: Null's signature ability, RKS System, allows it to change type based on the memory it holds, a nod to the Arceus it was modeled after
It strikes me as an interesting choice if you want to lean heavily into a charge counter build, but as of right now Im skeptical of spacecraft and the station mechanic in general, so Im assuming Kilo is the better of the two