Valeant Pharmaceuticals International Inc. (NYSE: VRX) and activist investor Bill Ackman announced an unsolicited takeover proposal of Botox maker Allergan Inc. (NYSE: AGN) for $47 billion on Tuesday. According to Money Morning's Capital Wave Strategist Shah Gilani, that move signals the beginning of an M&A wave that is set to hit the market. Watch Gilani's appearance on FOX Business' "Varney & Co." Tuesday, and see why this potential deal is so exciting for the market.