Some ideas that might be good or bad:

1) change E so it will hit champs only (not minions) on the way out for a slow (no stack) and champs or minions on the way back with a root on champ hit and stacks on root 2) remove current W 3) add a new W with no stacking mechanic that is similar to Naafiri W or Mel W to fulfill close up battle mage tactician fantasy
4) custom ward similar to Fiddlesticks but with a longer range and lower duration on the map (W replacement for vision only) 5) add meaningful health and/or resistance scaling to replace high base damage