Magmortar Lv X/Mew *

[Jaeger]

Magmortar LV X was changed to energy Cards right.

Can Mew* copy an opposing Mew* mimicry to copy your own pokemons attacks.

 

[PokePop]

Right.
The errata are all found in the Compendium LvX. Click on the Pokedex in the banner above and then "download"

Mew can copy the attack, but it doesn't copy it's point of view. It is still sitting on your side of the field looking at your Opponent's attacks.