well... that starts a large discussion about which mechanics are from MtG and wich are original, because we have a lot of mechanics that are also in MtG. You can say that there are basic mechanics and those are the ones we share with MtG, but always control a creature could be another. I'm totally opposed to copy from other games, but some mechanics are good and don't forget that the objective is to improve the game to make it more and more playable and funny.
Let's say that I'm agree with you: let's trie to invent new mechanics (like mutation, for example). But why not to use some that could fit in the game to work for this pourpose I was talking about?