Izsha by Ant9

Whenever Izsha deals damage to an enemy while attached to an ally, she heals the ally she is attached to for 150% of the damage dealt over 3 seconds. 

Cooldown: 8 seconds
Mana: 60
Strike the target, dealing 173 damage over 3 seconds if target is an enemy or healing for 173 over 3 seconds if target is an ally. 

Cooldown: 6 seconds
Mana: 40
Slither (quickly) towards target ally, attaching yourself to the target and healing them for 145 over the next 3 seconds.

Cooldown: 14 Seconds
Mana: 70
Deal 240 damage over 3 seconds to all enemies in the target area. This ability only triggers Symbiotic Relationship when hitting heroes. 

Cooldown: 2 seconds
Detach Izsha from her current target, quickly slithering away in the chosen direction.

Launch a dart that infests the first enemy hero hit, dealing 500 damage over 6 seconds and causing all basic attacks and abilities used by that hero to heal Izsha for 150% of the damage dealt.  Lasts 6 seconds.

Summon a viper that will fly toward target enemy hero and pick it up, returning to your location and dropping the hero. Hero is invulnerable while being carried by viper. Viper moves at reduced speed while carrying a hero. Killing the viper will cause the hero to be dropped. Trigger ability again to cause viper to drop hero, ending the effect. 

This hero cannot use mounts. Instead, Izsha moves wherever the hero she is currently attached to moves. (If Izsha is attached to a mounted hero she moves with them at mounted speed. Izsha. Izsha on a Brightwing = teleporting Izsha, etc.)