You're on the right track. You need Levitation to get it.
You have to climb up to the flat area at the mouth of the cave. Use your Levitation to bounce over towards the netting covering the rocks which are below and to the right (facing the cards on top of the rope). You have to switch to PSI Float after the highest part of the bounce-arc. If you time your switch to PSI Float properly, you should land towards the bottom of the netting and cling to it.
Climb up this first netting until you reach the top. At this point, there is more netting on the rocks to Raz's back but you can't really see it clearly. Do a jump and Raz should turn around and, if you've done it right, he should grab onto the second netting. It's tricky but it can be done (it took me forever!).
Climb to the top of this second netting. Then, again, make Raz jump. He should turn around and grab the rope. You may have to do a double jump in order to get over to the rope (I can't remember whether it was just a single jump or a double jump). And I'm not sure if you actually land on the rope or if you end up clinging to it.
If Raz is hanging from the rope, you make him pull up so he's standing on the rope (like you did in the Basic Braining world). Once he's standing on the rope, he can walk over to where the cards are floating. I'm not sure if you walk into the cards or if the cards are floating higher above the rope. If the cards are floating higher, position Raz under the cards and do a small jump straight up to "grab" the cards.
Getting these cards are a royal pain in the you-know-what because each part of the journey to get up to the cards is difficult in its own right.