This go by level and no by level deck. I try say this idea. By level wizard (or deck item).
Power dot: (max 8) allow show first this cards in battle. if you use a power dot you always see this card first. And you can see card with power dot if this have a purple dot (deck menu). No pvp :(
Back dot: (max 2) allow use this 2 treasure cards (from side board) first in battle. If you use a back dot you always see this treasure card first when you use draw. if you use this you can see a red dot in spell (sideboard menu). No pvp :(
Space card: (max 2): allow you can have a space for treasure cards in battle. If you use draw you don't need discard (if you have space card).You can use draw (and use 2 spaces) for use treasure cards without discard cards.Or too you can wait a turn and discard more cards or discard much t or all cards.
8 cards in battle + 2 space cards (treasure card only)