Which creatures from the alternative upgrade options do you choose?

But there will be no enemy creatures in the path of the swift riders because they must be placed there first, and no one in their right mind would do that. And even the target unit will take damage from the riders' ability, but only when enemies are encountered on the riders' path to the target stack. Maybe the developers will realize that they messed up with the riders and will buff them somehow... Although, how much time did it take to buff the elemental chains...?