Early game just use your Q to last hit. Since you will recall soon dont b afraid of taking a few hits from the enemy champion ur laning MID against. Once you get enuf for your lvl-1 boots and tear of the goddess recall and go buy. Never use your dark matter against enemy minions unless they are attacking your turret. I Guarantee if you play veigar properly you will be the most feared champion in your game i've dominated normal games and ranked games. The most ap i've accumulated with veigar was 1618ap with a score of 27-3-16 in a ranked match and im telling everybody now veigar is not countered by a banshees veil his Q ability at 39% CDR u pop their banshees with your q ability then do the famous viegar combo.

Veigar Combo- Stun, Deathfire Grasp, Dark matter, Ult, Baleful Strike.
I kno it 1 shots any champ in the game bcuz i do it every game, I 1 shot a singed with banshees veil and x2 Force of Natures, dont ask me y he got 2 all i kno is that i still 1 shot him.

After alot of practice everybody that tries this build will b as unstoppable as i am with veigar.

As most of u may have noticed i'm missing a 6th item in my build. That 6th item is all situational. Either banshees, warmoggs, or rylias personally idc i usually just get warmoggs bcuz i never get myself caught.