Whack-a-mole

You summon an intensive and damaging type of whack-a-mole game. Whenever a creature ends its turn within 15ft. of you, you may cause moles (2 moles in level 2 ) to appear under it and deal 1d4 damage to it, the creature may use its reaction to make a dexterity saving throw against your spell save DC + 2, on success, one of the moles is hit by a big illusinary hammer and disappears.

Higher levrls casting. You create a number of moles equal to the spell slot used to cast this spell.