This card's effect triggers "Divine Wind of Mist Valley" to swarm the field with two WIND monsters for a Synchro Summon or an Xyz Summon, and is one of the reasons why "Divine Wind of Mist Valley" is still Limited today.
"Mist Valley Thunderbird" is another WIND monster whose effect activates when returned to the hand. If this card returns a "Mist Valley Thunderbird" you already control to the hand, it can set up a Link 3 monster.
Use this card's effect while "Harpies' Hunting Ground" is active to destroy an additional Spell/Trap your opponent controls.