Harth Stonebrew by Zarco

CD: 20s

Add a random basic ability from another hero in the game to your abilities for a single use (goes in your "E" slot). Charged abilities are given uses equal to the number of charges they can hold. Certain abilities (e.g. Symbiote, Siege Mode, abilities requiring a resource besides mana) are excluded from the pool of possible drawn abilities. Cooldown is reset whenever a drawn ability is used.

80 Mana
CD: 8s
Skillshot
Summon Ragnaros from a card in front of you to launch a giant fireball in a straight line, dealing moderate damage to enemies it passes by. Upon hitting an enemy structure or hero, the fireball explodes for high damage.

70 Mana
CD: 12s
Summon Dr. Boom from a card at a location, dealing a small amount of damage. He summons two Boom Bots that will spiral outward from him for the next 3 seconds, exploding on enemies for area damage and slowing damaged enemies by 25% for 3 seconds.

120 Mana
CD: 100s
Send Leeroy charging from a card in on an enemy hero. Upon making contact, Leeroy will stun the target for 1s and will continue to chase the target and attack it for 8s, dealing decent damage and keeping it slowed by 40%. 2 whelps are spawned every second that will fly into Leeroy, reducing his duration for .5 seconds each (unanswered, this lowers his duration by about half), but they can be killed by autoattacks from the friendly team before they reach Leeroy.

90 Mana
CD: 60s
For the next 5 seconds, whenever Harth takes damage or uses a basic attack, a Grim Patron is summoned. Patrons persist for 5 seconds and attack nearby enemies, prioritizing heroes. They will not chase enemy heroes too far from Harth.