Gul'dan by Leonic

Gul'dan has no mana, but instead sacrifices his health or an imp within X yards to cast his spells.

Sacrifice X% of your health to summon two imps which will push that lane. The imp prioritizes attacking enemy heroes, then minions, and then structures. An imp can also be killed to power your spell cast. Lasts 10 seconds. 30 second cooldown. Cooldown starts when imps die or expire.

Instantly set the targeted area ablaze with Shadowfire magic for 5 seconds. Dealing X damage to anything in the effected area.

Channeled. Target an enemy and begin siphoning life from them, dealing X damage each second and healing you for 105% of damage dealt. Health gain increased to 155% when used against heroes.

Summon a volcano at the targeted location, tossing enemies into the air and stunning them for .5 seconds

Summon your apprentice, Cho'gall, to fight for you. Cho charges and attacks with his fist, while Gall fires bolts of shadow. Lasts 20 seconds. 60 second cooldown.