User blog:ExtremeKnightX/Help for a size 3 focus Deep deck

Recently my brother is having interest in the game and want to play a Deep deck. As I am not that good at deck building, I was hoping you all would be able to help.

This is a list of deck I am planning to build for him. I already have most of the card here except for Megiddo Tallica, Gallows SD and 1 more copy of Death Tallica.

Size 0:

Death Rulers, Gallows SD x3

Caster of forbidden technique, Velgaren x5 (Buddy)

Seventh omni eatrh lord, Count Dawn x1

Size 3:

Black dragon of demise, Death Tallica x3

Emissary of ruin, Meggido Tallica x4

Graveyard of demonic sword, Graybard x3

Divine Demon Slayer, Amenohabari x4

Fourth omni fire lord, Burn Nova x1

Death Ruler, Thirteen x2

Spell:

Abyss Symphony x2

Devil Stigma x3

Black Dragon Shield x4

Midnight Shadow x4

Death Grip x2

Accel End x2

Bloody Dance x3

Dark energy x3

Impact:

Over the grudge x2

This is the deck that I plan to build for my brother. I am considering to remove original tallica and accel end from this build but I could not think of a better card to replace them. I hope you all can give me advices and suggestions to improve this deck. Sorry for my bad English as it is not my first language. Thanks in advance for your help. (>_<)