The Overmind by JimmyCongo

Cooldown: 20 seconds

The Overlord Replaces your team's Core. Activate this ability to give all allied Heroes, Minions, and captured Mercenaries in the targeted area a small buff. A shield equal to 5% of their health, 10% bonus attack speed, 10% bonus movement speed, and 10% Bonus sight range for 10 seconds.

Cooldown: 30 seconds

Target an allied minion to spawn 4 Zerglings, 2 Hydralisks, and 1 Mutalisk that will aid the minions in that lane. Unlimited Range.

Cooldown: 15 seconds
AOE

Fire a drop pod that, upon landing, deals light damage to enemies in an area. Has a chance to spawn either 6 Zerglings, 3 Hydralisks, 4 Banelings, or 2 Mutalisks. Unlimited Range.

Cooldown: 45 seconds

Spawn an Overseer with the ability to detect invisible units, give vision, slow enemies, and disable enemy structures. Reactivate this ability to move the Overseer. Command it to move onto an enemy or ally to follow them. Upon death, all enemy structures in the area are disabled for 7.5 seconds and all enemy heroes are slowed by 30% for 5 seconds. Lasts 180 seconds. Flies over terrain.

Cooldown: 100 seconds

Instantaneously creates 2 Ultralisks, 10 Zerglings, 4 Banelings, and 6 Hydralisks in the target area. Last until death. Unlimited Range.

Passive ability.

The Overmind upgrades all allied minions into more powerful Zerg units. Each spawn creates 3 Zerglings, 3 Hydralisks, and 1 Roach.