I like the Idea, I would definitely play him. Even though I see him turning into a hard tank cc boss if anything. Which is ok. Deadlock doesnt have too many hard engage cc tanks. Hopefull he doesnt do too much dmg.
Denying soul collection seems kinda OP, to balance it, he should have to proc certain enemy or ally minions with a debuff or mark in advance. Like a Shiv dagger that can hit ally minions as well. Last hitting it would give gold immediately, but if the enemy last hits it should still be up for...