Mist Valley Thunder Lord

[ Thunder / Synchro / Effect ] 1 Tuner + 1 or more non-Tuner "Mist Valley" monsters Once per turn, you can select 1 card you control. Return it to the hand, and this card gains 500 ATK until the End Phase. This effect can be activated during either player's turn. ATK/ 2600 DEF/ 2400