Level 1
Study Weakness: Gain 1 stack when you or an ally hits an identified enemy with a basic attack. For every 10 hits, increase the vulnerability by 1% up to 5. After 50 hits, increase Identify's range by 20%.
Special Recipe: Gathering regeneration globes increases your health globe healing by 5 up to 100. After collecting 20 globes, your health globes also restore 5% maximum mana to heroes affected.
Quest Giver: Nearby minions kills give a stack of bribe, hero takedowns grant 5. If the enemy hero killed was under the affects of identify, it grants an additional 10 stacks. Spend 20 stacks to instantly defeat a mercenary. Holds up to 80 stacks.
Amplify Hero: Target ally deals 50% more and takes 50% less damage to and from non-heroes for 8 seconds. (activateable: 30 second cooldown)
Level 4
Oil Potion: Exploding Potion sets enemies on fire dealing an additional 40 damage per second for 4 seconds. Increase the radius of Exploding Potion by 15%.
Rancid Gas Potion: Exploding Potion leaves a cloud of gas where it explodes for 6 seconds, dealing 25 damage per second and slowing enemies in the cloud by 20%.
Back You Beasts: Every third basic attack knocks the target back a short distance.
Stamina Potion: Rejuvenation Potions increase movement speed by 25% for 4 seconds.
Level 7
Lucky Findings: Minions drop 2 potions upon death instead of 1.
Accelerated Crafting: You passively gain potion stacks every 2.5 seconds instead of 4.
Blood Serum: Enemy heroes drop 15 potion stacks if they die while identified.
Increased Stash: Maximum potion stacks increased to 45.
Level 10
Stay A While And Listen
Create Waypoint
Level 13
Globe of Resistance: Allies healed by your health globes take 20% less damage from enemy abilities for 2 seconds.
Stave of Evil: Basic attacks with your staff grant one charge of block for 2 seconds, reducing the next enemy basic attack by 50%.
Situational Awareness: Identify also reveals the area around the target for 6 seconds when it is cast.
Flash Bang: Exploding Potion blinds enemies hit for 1 second. Enemies hit near the centre are blinded for 2 seconds.
Level 16
Imposing Knowledge: Identify reduces the target's attack speed by 20% and ability power by 10% for 4 seconds.
Cleansing Potion: Rejuvenation Potions grant unstoppable for 1.5 seconds.
Extra Potent Globes: Increase the healing of your Health Globes by 75%.
Your Skills Are Impressive: Increase target ally's ability power by 25% for 3 seconds. (activateable, 30 second cooldown)
Level 20
Many Stories To Tell: Reduce the cooldown of Stay A While And Listen by 30 seconds and increase its radius by 10%.
Smooth Transition: Channel time for using waypoints is halved, and you can now have up to 5 waypoints active at a time.
Augmented Cube: Transmuting potions now consumes 2 stacks instead of 3.
Slay This Evil: The vulnerability from Identify now lasts the full 8 seconds.
Your talents proposals are quite interesting and even fun to play with, but putting a cube as the combat trait (which represents the true nature, the Essense, of the hero) is a total misunderstand of who is Cain the Elder, IMO.
Deckard Cain is first of all an Identifier, a artifact hunter and a storyteller. Not a Horadric cuber XD.
And what happen on Warhead Junction, when the target has a nuclear-bomb?