"If harpies destroy facedown wild tornado it can destroy hhg since it a face up card" You talk randomly without any knowledge. Wild tornado cant destroy field spell. And also wild tornado facedown destroyed>destroy faceup monster, not spell/trap. You say it without ever using it -*-
Wild tornado can destroy any face up card on the field. That includes: any (field) spell, trap or monster.. if you are going to be a keyboard warrior, at least get your facts straight.
The complete sentence is.. Wild tornado can destroy any face up card if it get destroyed while it is face down/set. I think u guys having ambiguation about its effect so i just want to help you