Y'shtola (and G'raha, above) are from a catlike race known as Miqo'te, who are vastly overrepresented in the FFXIV player base for reasons I probably don't need to spell out, right
Theyre very valuable even if you dont use them in your decks, and often useful in another format
Once transformed it becomes a saga called The Great Work, which deals three damage to an opponent and every creature they control as it enters, then creates three treasure tokens after your next draw step, before allowing you to cast instant and sorcery spells from your graveyard the turn after that
These are widely known and are fairly infamous at this point, which is a real testament to their power
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As you can see, both commanders reward dealing combat damage to opponents, and they both share the Rogue creature type - which gives us a clue about where the deck is headed