While putting cards in the Lost Zone literally means sacrificing cards that you will never use again in a match, some Pokmon cards can benefit from it, like this Cramorant that can attack for free as long as you have four or more cards in the Lost Zone: Another example of Lost Zone-hungry cards is this Giratina VSTAR that one-shots anyone with its VSTAR Power, Star Requiem: Will the Lost Zone be in Standard
The most logical next step would be a set focusing on Generation 2, with the featured Pokmon potentially being Tyranitar, Umbreon, or even one of the Legendary Beasts like Suicune
This is another impressive body you can cast for cheap, though two blue is definitely trickier than one
Theres also a few triggered abilities that further double-counters, like Byrke, Long Ear of the Law and Fractal Harness
A deck that focuses on graveyard recursion and land-based strategies would benefit from including Six in their lineup, as it provides a steady stream of land cards and enables the reuse of nonland permanents with retrace