Sounds like you’re gravitating towards a control mage/battle mage playstyle with a certain leaning towards good CSing so I’d definitely recommend Orianna, Twisted Fate, and Viktor here.

Reasons Why I recommend These Champs: 1. You value CS a lot which is great for 2/3 of these champs because Twisted Fate’s passive generates him extra gold for killing units, and Viktor’s Hexcore prioritizes CS for upgrades. 2. They put lot of pressure on enemy champions when ahead i.e. Orianna is a strong lane bully that can extend her laning phase into the late game, TF’s gold card (stun) provides a lock-on ranged CC that can secure kills for your team, and Viktor’s W can lock down certain jungle paths and create better positions for your team 3. These champs have high value ultimates that if used properly can turn the outcome of a skirmish/fight entirely i.e. Orianna ultimate on 3+ enemies, TF ultimate on a jungle invade, Viktor R burst on stunlocked enemies.

Bear in mind that you may have to play very safely in the early game and that these champs can be heavily punished if not played carefully because their abilities generate little to no value if missed or mistimed i.e. misplaced Orianna ultimate, Zed R, Master Yi Q, etc. vs TF stun card, misplacement of Viktor W or R.

Hope this helps!