I think I’ve got an idea for scion’s wishes. you contol 3 scions(palette swapped sajj) that starts at the middle of the board. bunch of soldiers appear on the left. and you keep them from reaching the crystals at the end. Each Scion would have different abilities. One can have blast, the other can heal, while another can, move faster. Your deck consists of a bunch of artifacts and spells(Neurolink would make them share all their abilities).
Every 1-2 turns, the entire board shifts to the left, so as to make it appear that the camera is moving to the right. Units that fall-off the camera are consumed by a Sandstorm/Rasha’s army. Once you reach the end, you take a final stand against rasha’s army and you have to survive a bunch of turns.