A top market analyst has listed top altcoins to stack for a possible breakout rally.Ethereum (ETH) is considered undervalued and presents a generational opportunity for investors.Ripple (XRP) is gaining momentum after the US SEC dismissed the legal battle with Ripple Labs.Binance Coin (BNB), Cardano (ADA), and Solana (SOL) are also expected to experience significant gains in the near future.