Didn't Kael say that the Council know the cards?
He didn't. He said that the Council and all Masters know the card
ideas. The cards use those ideas but Warmasters could have nerfed/buffed the cards without anybody knowing this.
For example the Sacrificial Altar from round 1 was brutally nerfed. In plans it was supposed to give 1 card for the entire team per 1 sacrifice. It was changed to 3 upgrades for 1 player per 1 sacrifice.
It makes the card less useful, but more equal for the teams.
Neither the Council nor the Masters know how the prototype cards were changed and at what order the will appear.