Mysterion the Dragon Crown

“1 Spellcaster monster + 1 Dragon monster Cannot be used as Fusion Material. This card loses 100 ATK for each of your banished cards. If a monster uses its activated effect to Special Summon itself, or a monster(s) with its same original Type (except during the Damage Step): You can target 1 of those Special Summoned monsters; banish that monster, also banish all monsters from the field with its same original Type. You can only use this effect of "Mysterion the Dragon Crown" once per turn.”