A jungle item that is focused on mobility and ganking

Just a quick idea: Make an item focus on getting around the map faster and getting a lot of ganks off and helping out your teammates. So I think it would be a lot better if after smiting a large monster it gave you a movement speed buff that lasted for a minute or so unless you take damage from an enemy champion or tower and on your next basic attack against an enemy champion you stun them for X seconds.Also maybe the stun duration can stack and what I mean is you smite 1 large monter and your next basic attack against a champion stuns for 0.5 seconds, you hold on to it and you smite a second large mosnter and the stun duration grows to 1 second you smite a third and its a 1.5 second stun and more than that it would be too OP :D :D. I just don't see people using this item and maybe this way it will get more popular with people who want to gank alot an snow ball lanes. So if such a change was made with the new and you will get around the map super fast. Tell me what you think guys.