You see, Painful Truths can act just like Ancient Craving for one less mana, as long as you spend black and 2 other colors on it
Hidden Dragonslayer takes place of High Priest
The Third Doctor who was played by Jon Pertwee has the Trample ability, meaning excess damage to permanents carries over to the players life total, and gains a +1/+1 buff for every non-creature token the player controls
You can see all translations for Abyss Eye here and all its secret rares here
This forces you to return Don, which synergizes with your Leaders effect, drawing you more cards and keeping the resources engine going
The archetype has no Main Deck monsters, only one monster with non-zero ATK (who cannot deal battle damage), and the effects of all its Quick-Play Spells cause the player to skip their next Battle Phase, forcing the archetype to entirely forgo combat to focus on Deck out