There are many I guess but only if the market will cooperate. If the market will be more bearish than bullish for the entire year, any good coin cannot even give you that. But assuming that the market will be in its good shape for a year and its performance will also be good, I think you can have the top altcoins. x2 is not that big after all. You can have ETH, XRP, BNB, EOS, XLM, LTC, and other top coins. Even Bitcoin can give you that x2 target.