Toxic Dart

You create a dart filled with magical poison and fling it at a creature within range. Make a ranged spell attack against the target. On a hit, the target takes 1d4 poison damage, and then another 1d4 poison damage at the beginning of its next turn. 

This spell's damage increases by 1d4 when you reach 5th level (2d4), 11th level (3d4), and 17th level (4d4).