Recommended Build

Playing as Kog'Maw

Tips to maximize your impact

Start with Caustic Spittle
Start your trades with Caustic Spittle (Q): it reduces the target's armor and magic resist, and its ranks also give you permanent attack speed.
Activate W before the fight
Activate Bio-Arcane Barrage (W) right before the teamfight: it extends your attack range, and your autos deal damage based on the target's max health.
Slow whoever charges you
When an enemy runs at you, cast Void Ooze (E) between you and them: the trail of ooze slows everyone who crosses it.
Save your R to finish
Save Living Artillery (R) for targets below 40% health, where it deals its max damage: each shot fired in quick succession costs more mana.

Compare against an opponent

Global strengths and weaknesses

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How to counter and exploit weaknesses

Engage when his W ends
Engage when Bio-Arcane Barrage (W) ends: his attack range drops back to 500, and the spell has a 17-second cooldown.
Punish his lack of mobility
If you can engage, go for him: with no dash or leap, Kog'Maw can only back off on foot, and Void Ooze (E) is his only slow.
Leave his R range at low health
Below 40% health, get out of range of Living Artillery (R): each shot then deals its max damage to you, and it reaches very far.
Move away when he dies
When he dies, move away from him: Icathian Surprise (passive) makes him explode 4 seconds later, dealing true damage to nearby enemies.