Kog'Maw Passive Change

I've been playing a lot of Kog'Maw recently (mostly jungle) and I love him to pieces. The only thing I don't like is his passive. While It can be wonderful for cleaning up a crazy teamfight, it seems that there's nothing you can do if the enemy team blows you up every time you show your face and you have to watch as your team gets decimated. Then the only thing you can do is follow the fed Ezreal with 100 health, hoping he doesn't blink away (which he does). Anyway, I was thinking of this being added to his passive:

If Kog'Maw kills an enemy champion with the explosion, he revives for 3 seconds with as much health the enemy had before they died, being able to only use basic attacks.

I'm not entirely sure if this would fit his thematic as much as his current passive, or that it's healthy for the game, but picture this: you barely escaped over the dragon barrier as the enemy Vayne decimates your Mundo trying to take drake, but she and Janna flashed over to follow you. You run left to the bush near red buff and start chunking down the Vayne as she gets near, but Janna uses her tornado to knock you up. You die to the Vayne but she got too close. You chase the 200 health Vayne down. She dies to the explosion, you gain 200 health, and you take the Janna out as well.