Dragonecro Nethersoul Dragon

Card text

2 Zombie monsters Must first be Fusion Summoned. Monsters cannot be destroyed by battle with this card. At the end of the Damage Step, if this card battled a monster that has an original Level: That monster's ATK becomes 0, also, if that monster is still face-up on the field, Special Summon 1 "Dark Soul Token" (Zombie/DARK/Level ?/ATK ?/DEF 0). (When Summoned, its Level and ATK become equal to the original Level and ATK of that monster.) You can only control 1 "Dragonecro Nethersoul Dragon".