This skill is only useful on certain maps so it is interchangeable with Fish Eye and Egg Hunt if you prefer one of those over being able to bribe

This is what i feel is a strong way to play Murky as it allows him to 1v1 enemies and if they start to run away, he can pop his bubble to heal and chase them down to slime them and beat them down to finish them off.

Now, the second build is better at playing if you have 4 supports to back you up but is not actually viable as you have very little survivability.

This build is my personal favorite. You can deal thousands of damage to a single target in seconds. The main purpose of playing this way is to quickly eliminate someone at the beginning of a team fight. When an enemy overextends and is separated from their team but your team inst focused on them, that's where this Murky build is best.
First throw your puffer down so the enemy is in range of the explosion
Second use Octo-Grab to hold them in place (and if level 20, smack them with a shark) and slime them while they cant move.
By doing a bit of math,
At level 20 against an enemy who has 5000 health while at level 20,
188.44 (Slime) + 898.36 (Pufferfish) + 449.18 (Tufferfish) + 750 (Wrath of Cod) + 300.18 x 3 (... And A Shark Too!) + 131.47 x 3 (Basic Attack)
That would deal a total of 3580.93 damage in 3 seconds, leaving the enemy at 1419.07 health. That would be easy for your team to clean up.