"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.
2 "Artmage" monsters
Must be either Fusion Summoned, or Special Summoned (from your Extra Deck) by discarding 1 Spell/Trap and Tributing 1 Level 7 or higher "Artmage" monster from your hand or field. You can only Special Summon "Artmage Non-Finito" once per turn this way, no matter which method you use. If this card is Special Summoned: You can Set 1 "Artmage" Spell/Trap from your Deck. Once per opponent's turn (Quick Effect): You can Fusion Summon 1 Fusion Monster from your Extra Deck, using monsters you control.