So we have a Sulfuric Vortex variant that also hoses some combos, a cheaper Geomancer's Gambit (mana-equivalent to the old one if you use it on yourself, since the land is tapped), a bigger Frenzied Goblin (if you ignore the tribal component it only works on walls and dorks, but that's still a good effect), and the cheapest Viashino Racketeer yet. The last guy is maybe a bit too cute, but notice that the relic continues to burn

A big guy and a land that doubles as an Act of Treason

Relic Robber is a really fun design.

I don't think I like the flavor of Relic Robber. Tuktuk the Returned was a goblin construct because the mind of a goblin was put into the construct that killed him. Is a small piece of Relic Robber's mind being put into each relic he steals? Does he keep killing other goblins to trap their minds in his relics? Are ruins all across the plane filled with goblin minds trapped in little constructs just waiting for someone to come along and steal them?

Tuktuk is a goblin golem. I think a goblin construct would be something more like Goblin Replica