In my 400 list (450 if you count the duals in the ULD), I've got:
{W}1 (flip Gideon)
{U}2 (Jace B, flip Jace)
{B}2 (LotV, flip Lily)
{R}3 (Koth, Pyromaster, Sarkhan)
{G}2 (OGarruk, Nissa WW)
Gold: 6 (Venser, Sarkhan, Sorin, Ajani, Ral, Kiora)
For a total of 16/400. No problems to report so far...