http://www.worldduelingacademy.com/t3197-tiers
You can check here
Psychic decks are allowed so long as they do not contain at least one copy of Grandsoil the Elemental Lord AND Serene Psychic Witch at the same time (if they do not have a copy of either card it is fine). I'll assume Mina did not use Grandsoil, so it is legal.