Yuki-Onna, the Ice Mayakashi (HISU-EN037)

2 "Mayakashi" monsters

You can only control 1 "Yuki-Onna, the Ice Mayakashi". While this card points to a Synchro Monster(s), your opponent's monsters cannot target this card for attacks. If a Synchro Monster(s) in your possession is destroyed by battle or an opponent's card effect while this card is on the field: You can target 1 face-up monster on the field, its ATK/DEF become half its current ATK/DEF until the end of this turn. You can only use this effect of "Yuki-Onna, the Ice Mayakashi" once per turn.