I saw another topic about shard of bravery, but this is a completely different issue
The mana issue is that saw you had 1 quanta left, then you use shard of bravery, draws a tower.
Play the tower to gain a quanta, so you have a new quanta (upped tower)
But you are unable to play another bravery shard again as it will say out of quanta
Fixed (Kinda): It was somehow my game was showing it costing 1 quanta, after a refresh it correctly displayed 3 again...