I would really like to see Prophetic Flamespeaker added to MTG Arena for Pioneer.
I know it is not a strong competitive Pioneer card and probably won't have any impact on the current metagame. For me this is more about casual deck building and having more options.
I play a Rakdos "keywords soup" deck with creatures that have different combat abilities like double strike, trample and lifelink. Prophetic Flamespeaker would fit this deck very well as a 3-mana creature and would probably be better than some of the cards I am currently using.
I can get the deck to Diamond, but I don't expect Flamespeaker to suddenly make it a top tier deck. I just think it would be a fun card to have and a good fit for this kind of deck.
There are probably many other players who enjoy building decks around unusual cards rather than only playing the current meta.
Prophetic Flamespeaker is already legal in Pioneer, but it is still not available on Arena.
If you would like to see it on Arena too, please upvote this request. Thanks!