Yes, you may level up as many times as you can afford to each of your turns
Root/Claw Fossil If you are running Anorith or Lileep (all the reprints of these cards are basically the same but avoid those from LA they count as Knocked Out Pokmon!) Multi Energy This card is just a Rainbow Energy except instead of placing ten damage on the user, its drawback is that the user cannot have any other special Energy cards on it, otherwise the card only offers one C Energy
9 Zhulodok, Void Gorger An Eldritch Terror An absolutely ridiculous commander, Zhulodok, Void Gorger takes all your colorless spells that you cast with seven or more mana and lets you cascade twice from them
I was working really hard on its development at the time
If I pulled them from packs, Id totally keep them
The cards requiring the most amount of currency are the 2-Shiny cards, which require 30,000 Shinedust each from both parties involved in the trade