Shudderwock by Nortin

Passive:
All of Shudderwock's abilities have two components: an active and an Echo. Casting an ability activates both, and for 9 seconds after casting an ability all of Shudderwock's other abilities trigger that ability's Echo effect as well.

Additionally, Shudderwock must wait 1 second between casting abilities.

Cooldown: 11 seconds
Cost: 50 Mana

Shudderwock leaps a short distance to a target enemy, activating all active Echo effects on them.

Echo:
Deals 83 (+4% per level) damage to the target. Also heals Shudderwock for 5% of his maximum health for every stack of Snicker Snack currently active.

Cooldown: 13 seconds
Cost: 65 Mana

Shudderwock grabs a target enemy within a short distance, pulling them to him and activating all active Echo effects on them.

Echo:
Deals 55 (+4% per level) damage to the target and Roots them for 0.65 seconds. Also grants Shudderwock 5% increased attack speed for every stack of Snicker Snack currently active, stacking indefinitely until Snicker Snack ends.

Cooldown: 9 seconds
Cost: 40 Mana

Shudderwock snicker snacks an enemy in melee range. It's not clear what exactly that means, but it does activate all active Echo effects on them.

Echo:
Deals 40 (+4% per level) damage to the target and grants Shudderwock 1 stack of Snicker Snack. These last for 9 seconds, stack up to 3 times, and reapplications do not refresh their duration. This Echo effect always activates first, if possible.

Cooldown: 80 seconds
Cost: 80 Mana

Shudderwock teleports behind a target enemy within a medium range, activating all active Echo effects on them.

Echo:
Summon a lesser copy of Shudderwock for up to 9 seconds. Lesser Shudderwocks have 600 (+4% per level) health, deal 50 (+4% per level) damage with 0.80 attacks per second, and prioritize attacking nearby enemy heroes.

Cooldown: 50 seconds
Cost: 70 Mana

Shudderwock lets out a roar affecting all enemies within a medium range around him, activating all active Echo effects on them.

Echo:
Repeat another random active Echo effect.