Artmage Diactorus (DUAD-EN032)

"Medius the Pure" + 1 "Artmage" monster
You can target 1 monster on the field; change its battle position. When your opponent activates a card or effect on the field, if you have 3 or more different Monster Types on your field (Quick Effect): You can negate the activation, and if you do, destroy that card. If this Fusion Summoned card is destroyed: You can Special Summon 1 "Medius the Pure" from your hand, Deck, or banishment. You can only use each effect of "Artmage Diactorus" once per turn.