Using Enchantments that return to your hand anytime they go to the graveyard is a nice strategy too, as you can get back the Enchantments effect while also making sure you continue to have fuel for Ertais ability
For example, some cards might boost all characters of a certain trait (like all Princesses get +1 lore)
Mew Ex Uses Opponent's Moves Against Them Stealing The Opposing Pokmon's Attacks When Mew ex was revealed, many people immediately noticed what the card could do in terms of its battling capabilities
I suppose playing it as a way to duplicate huge red creatures with ETBs or on-death triggers like Atsushi, the Blazing Sky would be solid
Some of the most valuable cards include Field Blower, Sylveon GX, and Mallow, with Sylveon GX (Rainbow Secret Rare) holding the top spot
Among these are a number of chase rares and special treatments, including a set of serialized cards