(2025-06-06) In the incredibly rare case where, during your cleanup step, Ancient Adamantoise is phased out with damage marked on it, Ancient Adamantoise's second ability won't apply and all marked damage will be removed from it during that cleanup step
The smaller deck size also means you can start crafting custom decks early on, especially since you don't have to worry about including Energy Cards
You are still casting the discovered spell if you choose to, so it can be countered
Where it really takes off is after the third chapter, when it transforms into Reflection of Kiki-Jiki, becoming a slower Kiki-Jiki, Mirror Breaker
And now since Leo has a card himself and is essentially Multiversal canon, it might be time to break out the red string and pushpins