They're a special kind of counter that stops tapped permanents from untapping
This attack makes this card a great option for coming back from the brink of defeat, as it deals up to 380 damage if your opponent has already taken five prize cards
When activated, if Mai controls three or more Harpie cards on the field, Phoenix Formation allows her to target and destroy every Monster in play on her opponent's side , and attack their life points directly
Regal Force Similar to Elves in Legacy, Mono-Green Devotion uses a multitude of green mana producers to reach a critical mass and end the game with Craterhoof Behemoth instead
Furthermore, it can be used during almost every turn, as it is usually banishing itself to gain access to its effect
I think it would be even stronger in this format, due to the lack of gust to move Flygon out of the Active Spot