It is frustrating when that happens. The thing is, commanders like Riku or Ghave, they are the precon commanders. Tons of people out there have decks with them, but in a small group of maybe six people it seems like it would not be an issue. We have been playing together for over two years, and he had never once produced a Ghave or Riku deck. He had never even once mentioned having a deck with either of those legendaries, and when I was feeling inspired to make something new Riku really jumped out at me. I don't think it was until he realized just how strong my Riku deck was starting to shape up to be that he decided to make his own. He would text me constantly, gloating about how awesome it was, even after I told him it irritated me. He proceeded to do much the same about Ghave after claiming to have already had a Ghave deck as well.
It's alright though. I've had a lot of input for my Teneb deck, and it is starting to shape up to be better than both of those ideas were anyway. That's life though. Sometimes great ideas fall apart, and even greater ones are born.
The worst trait about him though? His staunch refusal to play games to the completion when he is losing. If he is winning, he will play all the way to the end, but if he even gets a whiff of a loss, he immediately concedes and wants to start over. I get that in some situations you are hopelessly going to lose, but part of the fun for me is seeing the crazy things that people pull off in their decks, and I have no problem losing, and am certainly not going to concede. That ruins the fun.
That's not even close to true.
Consider the fact that you have to design what goes into your deck. Sure, you can look online for ideas, but ultimately what you put in there is up to you. Secondly, while you may not have direct control over your draw, you do have to have a measure of skill at deciding what to do. Being one step ahead of your opponent, being ready to react, or knowing when to be patient, even as your life total dwindles. Luck comes when you draw the perfect opening hand, skill is how you use it. Skill will always trump luck, even in mana draws, because you decided which lands to use, and how many of them to use.