I was previously a senior editor at Geek.com and have written for The A.V
If the top X cards of your library don't contain a creature card that doesn't share a creature type with a creature you control, you won't get to put a card into your hand
The final room of The Undercity is a pretty huge swing, but introducing the initiative into a game where you're unable to defend it is a losing proposition
This powerful ability ensures that you'll be able to comfortably play Thrumming Hivepool in the mid game (and possibly in the early game, too)
On the other hand Kumena does not work alone, he needs more generic combo piece cards and much more setup but when a combo triggers he can end the game, so he is a high risk, high reward choice
Your high-end is unmatched and youre very consistent at doing what you do, but youre also the most vulnerable since you dont have reach or interaction