one piece emperors of the new world booster box TCG: in Pack The New Four Emperors Take the Helm in the 9th Pack One Piece Trading Card Game

Of course, this synergy costs an infinite amount of mana (nine total to go through the loop), which means it's probably not good enough, even considering that Yorion's blink synergizes with most battles, but the slight possibility of this mattering keeps Invasion of Xerex from F-tier

Deadly Plot Back-to-back Black uncommons

The nice aspect of this card is that youre making Clues as you trigger paradox, while having 2 colorless mana from both creatures to immediately crack Clues tokens and more

Couple that with the fact that some ridiculously strong items are being released in Into the Inklands and undoubtedly we are going to see the rise of a new archetype and best Lorcana deck: Sapphire/Amethyst Items

Its also worth noting that First Day of Class isnt only useful in combo situations either as long as you have any deck that churns out a lot of bodies in a single turn, it can be a good way to get a more conventional win too

I did not find any on youtube, card market etc