Had our first playtest last night. Dreadhorde Arcanist was one of the few picks that I couldn't justify, and looking at it there's only like 4 1-mana spells you could get back and no spell-based way to buff it. So I went looking for a solution, and in fact the rw deck could use a little more something. Flamescroll celebrant is a perfect fit both on the axis of giving rw a taxing effect for opponents when they land walkers, and can be a late game extra turn spell if you need it to be.

Will make some more changes with more tests