Just be sure to have plenty of tokens and dice ready to track your army
Additionally, it looks to be highly impactful to Pioneer, which will make up the constructed portion of the Pro Tour
Your odds are 1/32 for one of these, making them relatively common as a side effect of the hunt for more valuable cards
This has resulted in "Red Card" being banned for how heavily it can swing the tempo of the game and "Iono" being played at 4 copies in almost every deck for its ability to force both players to mulligan and give the losing player more card advantage than their opponent
Marketplaces like ChannelFireball, TCGplayer, and Face to Face Games just dont have the manufacturing capabilities to produce their own custom sleeves and they likely outsource that work to these sellers
I also predicted Yuna would help with summoning creatures, which she does on both her cards, and that Aerith's sacrifice could be respresented with a death trigger of some sort