Dark, Metal, and Dragon were all absent in the TCGs original iteration, with Dark and Metal-types not being part of the franchise at the time
Sure, it costs 12 mana, but thats why the deck includes multiple ways to make it easier to cast
This feels like a three-drop on curve dork that can lead, or participate in, Hate Bears brews around things like Aven Mindcensor and Esper Sentinel
If the Pokmon its attached to also has a R Energy attached, then that Pokmon has no weakness
Turning one-for-ones into two-for-ones is a very appealing effect, and it even turns itself into a big creature for you to win the game with
Bestow allowed you to cast a creature as an Aura instead, attaching it to one of the creatures you already control on the battlefield