Hostile Investigator is a solid statted 4 drop that makes your opponent lose a card and gives you one for later. Subsequent discard effects generate you more card advantage. While I love Gonti, Lord of Luxury, he often was an overcosted blocker that looked at 4 useless cards, so for now he’s out.

Twinferno was one of the lowest picked red cards in the cube and it was basically only there for a red 2-drop spells matter synergy. Return the favor is a vastly superior wild ricochet — another personal favorite that didn’t make the initial cut for cube. However this version has a lot of flexibility and some ridiculously cool high-level plays like copying an opponent’s animate dead trigger. (If you’re unaware, look that up, its a wild interaction).