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Many, many versions of that kind of card have popped up over the years and commanders like Sythis, Harvest's Hand, Calix, Guided by Fate and Tuvasa the Sunlit often fit the bill

(2017-08-25) If you somehow control a Herald's Horn with no chosen creature type, no spells will cost less to cast, not even creature spells with no creature type

Well, you'll either need to collect the cards from Arena booster packs for the sets they came in, or else directly 'craft' the specific cards you need using MTG Arena Wildcards - effectively tokens you can exchange for the exact Common, Uncommon, Rare, or Mythic Rare card you want, depending on the type of Wildcard

But, on what

As the lead Heroine of FFVI it makes sense that she would be the one to lead this deck