Presuming of course the "better selection" you made was actually a misplay, but this is all very worst-case-scenario talk
The Lunar Whale Playing cards from the top of your library is always nice because it sets up good synergies and combos, and it gives you more information
What are the top chase cards in Pitch Black
Your opponent will likely try a big attack to take Kid down, but your blockers will divert these attacks, shutting opponents for the turn and buying you time to strengthen your board and set up powerful strikes
You need a lot of fixing and thus a lot of lands, but equally, you can't dedicate too many slots to fixing and so the sweet spot is much more heavily highlighted that it is in normal cube
You only get to use Professor Elms Training Method, Pokball, and Dual Ball