Against veigar, The longer the game goes, the stronger Veigar will be thanks to the unlimited stacking with his e. End the game as quickly as you can.

Veigar is rather weak and vulnerable in the early game. You could try to abuse this to set him behind and miss out on stacks.

Once Veigar has his Ultimate R, his kill pressure increases. Keep in mind that he will deal a lot of extra damage at this time.  Against veigar, The more the game goes, the stronger Veigar will be thanks to unlimited stacking with its e. End of the game as fast as you can. Veigar is quite weak and vulnerable in early play. You could try to abuse it to put it behind and miss it on the piles. Once Veigar has its Ultimate R, its death pressure increases. Keep in mind that it will do a lot of extra damage at this time.