Champion concept (Nightstalker)

If you played Dota 2 then you might have heard of night stalker these are his abilities.

Q (void) - Creates a damaging void that slows an enemy unit and deals damage. Void also mini-stuns, interrupting channeling abilities. The slowing effect lasts longer at night. Deals half damage during day.

W (crippling fear) - Night Stalker horrifies the target enemy Hero, causing it to miss attacks and become silenced. The effect lasts longer at night.

E (hunter in the night) - Night Stalker is in his element at night, attacking and moving with great swiftness. Can be activated during night to grant Night Stalker flying movement for 2 seconds.

R (darkness) - Night Stalker smothers the sun and summons instant darkness, so that he might use his powers at their fullest. While Darkness is in effect, enemy heroes, units and wards have their vision range reduced.

If riot could make a champion that has a passive that changes the map by having a periodically shifting day and night effect that would be insane, a champion like this would have clear weakness while also also having obvious strengths while giving room for counter play and would also force enemy players to play around this day and night passive ability, it would make for a very dynamic and interesting game play. What do you think about a champion concept like this?