One such card is the Sloppity Bilepiper, who can sacrifice old cascade creatures (or even himself) to start the cycle anew
And if you havent seen the Mega Diancie ex from Ascended Heroes yet, its worth looking up
For those that are a bit more limited in terms of budget, it will take extreme luck or quite a bit of time to grab the pricier cards
Personally, I think HGSS, Triumphant, and Black/White are the most valuable packs
In terms of upwards potential, you could easily get this deck into Bracket Three without even needing to include any Game Changers
Such decisions require a lot of intricate thought and planning, and in a casual setting it's not as important, but at public events where prizes are on the line, you want to win, and avoid misplays and unwise decisions