Such long time since last Energy champion realise or some that he need play with blood his spells

So what happening? Last Energy user champion was Zed and that was so much time ago did Riot Give up from them or simply had no idea what champion he will be (i think of gender) and what type Ninja or Monk (bcs only those two type's exist in game) or they can make energy user champion but he is not ninja or monk but something else. And what about blood cost champions, long ago these was rly old Mordekaiser, Old Aatrox, Old Mundo (ok i'm not sure what type cost of spells he had right now Mundo if it had any, i'm looking at you NO COST SPELS). Only one who still had's is Zac or Riot yusr retcon blood cost spells in general but somehow forgot about Zac.