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Playing as Zac

Tips to maximize your impact

Smash them into each other
After Stretching Strikes (Q) on one enemy, hit a second enemy with your auto: you fling them into each other, and if they collide, they and those nearby take damage.
Pick up your Goo
Pick up the chunks of Goo you shed when your spells hit: Cell Division (passive) heals you for each one, and Unstable Matter (W) comes back 1 second sooner.
Charge your Slingshot out of sight
Charge Elastic Slingshot (E) from the fog of war: the enemy has less time to react, and the longer the charge, the longer the knock-up on landing.
Bounce into the middle of them
Cast Let's Bounce! (R) into the heart of their team: the first bounce knocks back each enemy hit, the following ones slow them, and you can cast Unstable Matter (W) at the same time.

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Analyze a draft with Zac

Playing against Zac

How to counter and exploit weaknesses

Step on his Goo
Walk over the chunks of Goo he sheds: you destroy them, and Cell Division (passive) can't heal him with them anymore.
Spread out after his Stretching Strikes
If Stretching Strikes (Q) grabs you, spread out from your allies and minions: his next auto on one of them flings you into each other.
Interrupt his Slingshot
If you have a stun, a silence, a root or a knock-up, use it while he charges Elastic Slingshot (E): his charge is interrupted before the jump.
Kill all his bloblets
When he dies, kill his bloblets: Cell Division (passive) splits him into 4, and if any remain, he comes back to life. This passive has a 5-minute cooldown.

Abilities and cooldowns

Cell Division (P)

Each time Zac hits an enemy with an ability, he sheds a chunk of himself that can be reabsorbed to restore Health. Upon taking fatal damage, Zac splits into 4 bloblets that attempt to recombine. If any bloblets remain, he will revive with an amount of Health depending on the Health of the surviving bloblets. Each bloblet has a percentage of Zac's maximum Health, Armor and Magic Resistance. This ability has a 5 minute cooldown.