Prowess and magecraft are both triggers that reward casting noncreature spells, but a prowess deck typically wants a board of creatures to pump and attack with, while spellslinger more broadly includes commanders like Niv-Mizzet or Mizzix that never attack at all
But your big ol creature may not have trample naturally, so you have to give it to it
Etherium-Horn Sorcerer provides an excellent mana sink that can Fog a creature and synergizes with artifact decks
Its certainly a more strange and possibly lower powered approach at a Simic ramp deck, but it would have a very unique and fun feel that will impress other players
The Masamune powers up Sephiroth, basically, but can it do much outside of that
The dialogue here suggests that we cant continue to accurately call something casual or competitive simply because it has one of the elements