you want to prevent early jungler power, look for ideas having to do with turrets

maybe instead of buying a ward buy a temporary upgrade to a turret. it might take like 10 seconds to activate and last like 1 minute and 45 seconds. could give the turret like bonus range and increase damage allies deal while under turret. or give them like tenacity, more the closer they are to turret.

The activation time is to prevent them from using it if they were truly caught off guard. maybe this item can only be purchased in the first 15 minutes of the game.