This is already fine for four mana, but if you can even get one more body on entry, Mysterio turns into a fantastic creature
With 40 starting life, the card draw is absolutely worth it
Furthermore, it is possible to increase this damage even more if we use the regular Lucario with the Fighting Coach ability, which allows attacks used by your Fighting Pokmon to deal 20 more damage to the active Pokmon (and the opponent does not even need to be a Pokmon ex!)
This damage may include heavy wear, creases, dents, scratches, bends, scuffs, tears, inking, water stains, and/or other types of damage
Then, draw 10 cards
Mirri and Gerrard have been the best of friends since they trained together under the maro-sorcerer Multani