I was reading about the "Create Bonfire" cantrip. If I cast this upon the square a creature is standing in, they must succeed on a Dexterity saving throw or take 1d8 fire damage. This sounds like a fairly powerful cantrip (1d8, and it can harm over time, too). I was thinking of taking this as my "damage" cantrip. It seems like a better spell than let's say Produce Flame
Could I simply spam this concentration spell to cause 1d8 damage per turn? If so, could I conceivably cast it repeatedly on the same square?