Mal'Damba counters Skye. His gourd can reveal her through his tick damage, he can immune her entire ult and poison damage, and she has no defense to his ult.

Koga's shadow step cleanses Luna's rush mark.

Zhin can counter your damage, and billow to avoid Heavy Combat's burst.

Grohk using maelstrom can farm easy damage off of your team using Luna. Your best bet is to hide Luna behind a shield if you're capping the point with Luna. With totemic ward, he counters Luna's rush and your ult.