winning Duels verifies his sense of self, and to lose is to lose himself, which he believes to be the secret to Yusaku's strength
You can either pair two creatures with the generic partner keyword (the most infamous, top tier of commanders is the pair: Thrasios, Triton Hero and Tymna the Weaver) or you can use creatures that have specific partners with abilities, like Haldan, Avid Arcanist and Pako, Arcane Retriever or Amy Pond and The Eleventh Doctor or Rory Williams
Ugins Labyrinth You need to be a very specific deck to leverage Ugin's Labyrinththat is, something resembling Modern Tron with expensive colorless cardsbut decks that fit that description get an incredibly powerful Sol land
Prerelease and Illustration Rare Wartortle cards are particularly sought after for their limited availability and stunning artwork
Quagsire costs 400 Pack Points to craft
Being better than just a Populate, as this can copy non-Creature tokens, I quite like the concept around this card in the Command Zone, but it's probably outmoded by Ghired, Mirror of the Wilds