The Construct tokens, affectionately called Karnstructs, are the same made by Urza, Chief Artificer and with the two creatures in play, youll have a full battlefield in no time
Cheap artifact creatures, equipment, treasure makers, sacrifice fodder, mana rocks, and artifact payoffs all support multiple decks
The distinction is small, and you should be happy adding signets or talismans to your deck when you need the fixing and ramp
The wording allows you to either generate a second copy of the same creature from your deck, or grab a completely unrelated creature which happens to share the same total stats
Not only is Captain Sisay a dual-color card that we can hit with Niv-Mizzet, Reborn, but we can also just cast it naturally and use it to find Niv-Mizzet, Reborn or a planeswalker