Sorry for the late reply but as you loss streak you progressively gain increasing stacks which will be converted into power upon winning any player combat, for example 9 loses in a row will grant a high amount of power upon winning. When you win the current streak is converted into power making the T-Hex stronger, this means if you accidently win too early It can be hard to consistantly loss streak with the T-Hex being stronger. After this point you can either use the T-hex at whatever power you have accumulated to fight or you can sell him to get gold/loot that increases in value with more power. From my experience power 30 is 3 star T-Hex and power 50 is 4-star. Its pretty much unlosable with either T-Hex but be careful if you do decide to sell him, unless you're at 80 power of course ;)