Prince Phillip Vanquisher of Foes then becomes viable as a board-wipe and a stacked character for the same cost as Monstrous Mal
For example, if a creature you control has a 4/4 sticker on it, but it also has three +1/+1 counters on it, it's a 7/7 creature, but Ambassador Blorpityblorpboop's base power and toughness would become 4/4
If you have any sacrifice outlet in play, such as Phyrexian Altar, you can then generate card advantage by sacrificing opposing creatures
At the end of the day, I find I enjoy the narrative element a lot
Charizard ex burns up the opposition's lead with the cunning firepower of a Darkness-type Pokemon
If the chosen permanent is copying something else (for example, if the chosen permanent is another Copy Enchantment), then your Copy Enchantment enters the battlefield as whatever the chosen permanent copied