Oh man I love Veigar. At level 5 it just becomes hilarious to time your E with the last minion needed to level, instant assign to r, wrq, get kill. I made ahri my bitch in lane. She lands e, dashes in, e wears off cause it's level 1, now it's MY turn bitch. R Q oneshot, or R Q, bait out second dash from overwhelming damage, E to W.
Unfortunately we couldn't capitalize on it because I couldn't blow up ez from all the cleanses and heals, and Ahri learned to wait outside the teamfight and poke in until I was forced to ult somebody else.