Riot hates Zac.

Zac is puny. He has no sustain. (Drops a blob, someone steps on it, no sustain. Drops a blob, lands closer to enemy than Zac, no sustain. Dies and splits into 4 blobs that have 14% of health, definitely no sustain.) Not to mention, he's a tank, so there has to be sustain if there is no help in his kit. If there is no sustain, make him into a fighter and give him some real damage. Make his passive give each blob 25% of his health and try and get the full 100% health back. Anavia gets full health (mage). Aatrox gets full health (its possible)(fighter). Zac may gets only 50% of his health; yet its his health he needs to fight.

RIOT HATES ZAC

Why am I saying this? Because, if I can play a Nautilus middle and a Gangplank, Udyr, and even a Aatrox, Zac should also be possible. So, if Zac isn't playable mid, then something needs to be fixed.

Suggestions to help Zac.

Make his passive more like this; make his blobs give only 2% of his health, but for every blob there is on the field, he should get a bonus 2% health regeneration. When Zac dies and his passive is activated, his 4 blobs should have 25% of his health and give him up to 100% of his health. There almost no way Zac should only get 50% (or less) of his health back. I've also noticed that blobs seem to fly towards enemies more than away when Zac lands a attack.

His Q should be able to pick up the blobs because it makes no sense that it shouldn't.

His W should cost only 1 or 2% of his health.

Now, we can make his E 5 or 6% of his health.

And give his R two knock backs and keep the 1 possible stun for the 1 second.

Know what this will do? Make Zac play-able in lane, again. Just playing him in jungle is hard enough. Why should I chose Zac in jungle over Lee Sin, Nunu, Fiddlesticks, or (my main) Udyr.