Gizmek Kaku, the Supreme Shining Sky Stag (MP21-EN007) [2021 Tin of Ancient Battles]

If a monster is in the Extra Monster Zone: You can Special Summon this card from your hand. You can target 1 face-up monster in the Extra Monster Zone; equip that face-up monster to this card (max. 1). When this card destroys an opponent's monster by battle: You can Special Summon 1 of your Monster Cards equipped to this card. You can only use each effect of "Gizmek Kaku, the Supreme Shining Sky Stag" once per turn.