Please be carefull with just following the portfolio of bluemagic.

What I think could happen:

Bluemagic decides that coin xyz is a good coin and they buy the coin
Due to that action the coin goes up
People who follow the portfolio of bluemagic decide to do the same: depending on how fast you follow you buy in on the coins while the price goes up more and more
Result: you buy in on the coin while the price is rising or high

Bluemagic sees the price going up and decides to sell the coin for profit
Due to that action the coin goes down
People who follow the portfolio of bluemagic decide to do the same: depending on how fast you follow you sell the coins while the price goes down
Result: you sell the coin while the price is going down or low

Need I say more?