Chris Vermeulen (@TheTechnicalTraders) says there's a seasonal "sentiment shift" occurring as Mag 7 stocks stall. He believes growth stocks and small caps will lead the Santa Claus rally. Chris notes a "great trade" opportunity in precious metals like gold but warns it will happen fast before a fade. He explains the 15% rally he sees coming in the SPDR Gold Shares ETF (GLD). Chris sees other metals like silver and platinum rallying as much at 50% before a top is put in.