For this combo to work, you need Sage of Hours and Ezuri both out on the battlefield, and you may have collected at least five experience counters through Ezuri's ability
The deck's focus on including a wide range of recognizable creatures from FFXIV means there aren't enough spells to make full use of Y'shtola's abilities
For two mana, you can surveil, then cast an instant/sorcery card from that stocked 'yard and then exile it
For that money, you are getting 24 Jumpstart Boosters, each containing 20 Avatar-themed cards
If you can reanimate this for cheap, then for only four black mana, you get to draw seven cards
You know what else does that and has been doing so for more than 20 years