"Fabled Realm's Revival" and 2 Set Cards "Abominable Chamber of the Unchained" and "Fabled Treason" in the Spell & Trap Zone
Deep Sea Diva allows you to special summon any level 3 or lower Sea Serpent monster from your deck, giving you all the materials you need to perform a synchro summon
For modern cards, this will likely continue to compress the PSA 10 premium over time, because supply keeps increasing
The Pokmon Company has attempted to address this by printing billions more cards, but it seems they remain a strong temptation to thieves
Maelstrom Nexus The first spell you cast each turn with Maelstrom Nexus on the battlefield will cascade into a free spell of lesser mana value
-Destiny Board: Have Destiny Board "F" and the spirit message "I", "N", "A", and L" in your deck