Master Key Beetle's Mirage

You can only use this Skill's first effect once per Duel, and the second effect once per turn. 1: If you control "Number 66: Master Key Beetle", Set 1 "Corrupted Keys" from your hand. (This card can be activated the same turn.) This turn, you can only Special Summon a monster(s) once. 2: If you control "Umbral Horror Mirage Token", make 1 Xyz Monster you control gain ATK equal to the combined ATK of "Umbral Horror Mirage Token" you control until the end of this turn.