This effect activates when a Field Spell Card resolves. It starts a Chain Link. (This effect is not activated in a chain to the activation of a Field Spell Card.)
This effect is not activated if the activation of a Field Spell Card is negated.
The "Once per turn: You can target 1 face-upAttack Position monster on the field; destroy that target. There must be a face-up Field Spell Card on the field to activate and to resolve this effect." effect is an Ignition Effect. (It targets 1 face-up Attack Position monster on the field.)