Now, I have in the past advocated for the fact that I don't think Theoden is as bad as people think he is, most notably in this old blog post: wardenofarnor.wordpress.com However it is important to point out that there is a wide gulf between "not as bad as people think he is" and "good compared to the majority of heroes"
If you can copy it, it kind of becomes worth the mana investment, except you could just play a card that was worth what you're paying in the first place, and copy that
You already know which player you want to be, so make sure you are piloting a deck that helps you get there
Whether you prefer TCGPlayer, CoolStuffInc, CardKingdom, or your local game store, youll probably find some inventions lying around
This would be (slightly rounding) 26 of each mythic and 52 of each rare
It rewards careful timing and card sequencing, giving skilled players a strong advantage in competitive settings