To double a creature's power, that creature gets +X/+0, where X is that creature's power as Double Trouble resolves
As announced, the four commanders are Terra, Cloud, Tidus, and Yshtola, so you can expect decks inspired by Final Fantasy VI , Final Fantasy VII , Final Fantasy X, and Final Fantasy XIV
Bartolome del Presidio is also a perfect fit for our Aristocrats theme, providing a perfect sac outlet in the command zone and growing as a nice payoff as well
Poissonniere de Nouvelles is an extremely important card to the Nouvelles engine that the Deck runs, since if you Normal Summon her from your hand, you can add a Level 1 Ritual Monster or a Recipe card from your Deck to your hand, which grabs you Clown Crew Flair to use later for the Clown Crew Rehearsal s banish effect, which performs a Ritual Summon
But its definitely not one worth spending your money on