You mean like Eidolon? We can have him both take powers like ours and practice with them and take powers that counter ours and practice against them. And it's not like there is that many abilities that are not weak against us. Mostly flavors of intangibility, power immunity and long range instant attacks with in built targeting such as mind control. Your garden variety city worth of gangs and heroes will usually fold instantly.
Speaking of which, we could create ourself hermetically sealed sphere of hyperdense metal, which would act both as pretty potent ablative armor and means of visual obstruction. If we want to be extra mean, we could have multiple spheres flying around and have opponent try and guess which one we are hiding in. While we are actually hidden underground.
Also, (Event) Horizon!
