They're somewhere in the middle of the road, and cards in this range could jump in and out of the meta depending on how it changes, either within the current set or possibly even future sets
The deck focuses on quickly casting Y'shtola and then using her ability, along with a number of other effects that trigger with spell casting to quickly drain out your opponents, dealing massive amounts of damage
On the Terra EX card from the games Hidden Trials expansion, Terra can retrieve a Summon card from the players Break Zone to their hand
more and more sacrifice cards reference creatures or artifacts, like Deadly Dispute and its many variations, or Al Bhed Salvagers
Locally, I know that there are a lot of Steelsong players, so trying out Ruby/Amethyst may not be the best idea