"Grim, the Avenging Swordsman" + "Necron, the Demonic Warrior"
This card can only be Special Summoned from your Fusion Deck by removing from play the above cards on your side of the field. (You do not use "Polymerization".) Increase the ATK and DEF of this card by 100 points for each Warrior-Type monster on the field and in either player's Graveyard. Each time this card destroys 1 of your opponent's monsters and sends it to the Graveyard as a result of battle, increase the ATK and DEF of this card by 100 points. When this card is Destroyed, you may special summon 1 "Grim, the Avenging Swordsman", or 1 "Necron, the Demonic Warrior" from your Remove from Play pile.