Interesting extra turn ubb interaction

When a unit like ravea or ezra uses their ubb it gives an extra turn to everyone or themselves, however if they use a second ubb they themselves and only themselves get an extra turn again and can repeat this as long as they have overdrive, this is easy to do in the test zone with infinite ubb and possible in normal conditions with Arthur or natalame double cast with Ezra but unlikely to happen, if this casting of ubb gave everyone an extra turn each time then it would have been possible to completely break the game with enough od fill