Yuffie isn't put onto the battlefield until the ability resolves
Teferi's last ability means that in order for an opponent to cast a spell, it must be that opponent's turn, during a main phase, and the stack must be empty
And, Resourceful Defense returns from the Streets of New Capenna Commander Decks, as does Damning Verdict, both of which are vital to any strategy involving counters (as the Bant deck in that set was also themed around)
Oh, and dont forgetits a Dual Ink card, so make sure your deck runs both Amber and Sapphire
This perfectly captures his heroic final stand where he sacrificed himself to save Cloud and passed on both his legacy and the iconic Buster Sword
Having cards in your hand can easily become a problem, especially later in the game, so any card that allows an easy way to build up your hand is crucial