When you copy a spell, you copy all modifiers, including additional costs like kicker
If an activated ability of a card in exile with a brain counter on it references the card it's printed on by name, treat Rex's version of that ability as though it referenced Rex, Cyber-Hound instead
Big creatures are good
The first issue can be easily solved by just molding at least 2 of the Thought Erasure into either Thoughtseize or Inquisition of Kozilek so you almost always have it in your opening hand (the last erasure can mold into either another of them or a 4th Spell Queller) Drown in the Loch seems like a really good tempo option so i would take out the 2 Discovery / Dispersal for 2 more Drown in the Loch
When you can parlay stolen creatures into card draw and possibly a free permanent, there's every reason to think Eddie Brock can win games
Their impression of grace fades when the first gust sends them crashing into one another." Molimo, maro-sorcerer Commander, Legacy, Modern, Vintage Alchemy, Brawl, Competitive Brawl, Historic, Pauper, Pioneer, Standard, Timeless