I wanted to make it work in a +1+1-themed deck of mine (Leinore) but couldn't fit its high CMC, sadly. Quite a shame given that it's a very versatile card
I have a Leinore deck as well but it runs a lot of Thalia noncreature hate so never even considered it
Currently planning a Beledros deck though which this slots in well, as it's a big-mana deck that likes the lifegain, ramp and the 1/+1 counters for a surprise finisher if I have enough tokens
Very interesting direction you took with the deck - I like it! Also pretty cool that you're only running a single artifact and only five sorceries; most of the power comes from your creatures it seems.
Mangara is such a good card. Any white-x deck can run it, really