Befriend the Powerful

Take control of target creature with power X
Once upon a time, a little girl wandered into the forest. While exploring the woods, she came across a mighty dragon, the dragon said, "what are you doing here little girl, it is not safe." The girl replied, "i have few friends, so i made nature my friend." The dragon took pity on the girl and decided to take her home. The dragon said, "if you have few friends, then i shall be your friend.