Working on my third rarity growth since Christmas. It's 1150 gems for the cheapest ones. "Dealing with it" is relatively easy on DMM because they didn't design it to be ignored by 90% of players. Petals are also supposed to be easily obtainable via quest reward or coin exchange or the occasional farm maps.

The endgame content is maps currently recommending 680k power without a helper, not improving your characters.