Bakura's "Necro" cards

Necro Jar
Level 3 DARK Zombie
1100/300
Cannot be destroyed by card effects. If you take battle damage from a battle involved this card, your opponent sends cards from their deck to the Graveyard for each increment of 300 battle damage you took. You can only activate this effect of "Necro Jar" once per turn.

Necro Soldier
Level 2 DARK Zombie
0/0
If this card is face-up on your side of the field at the start of your Standby Phase, you can activate this effect: Special Summon up to 2 "Necro Soldier" from your hand, deck, Graveyard, or banished zone, but destroy all monsters you control during the End Phase. This card cannot be tributed or used as material for the summon of a monster from the Extra Deck.

Necro Wall
Level 3 DARK Zombie
0/0
During your Main Phase, you can Special Summon any number of "Necro Wall Tokens" (Fiend-Type/DARK/Level 1/ATK 0/DEF 0), up to the number of "Necro" monsters in your Graveyard. "Necro Wall Tokens" cannot be tributed or used as material for the summon of a monster from the Extra Deck. You can only activate this effect of "Necro Wall" once per turn.

Necro Mannequin
Level 3 DARK Zombie
500/500
During your opponent's Standby Phase, you can Special Summon 1 "Necro Mannequin" from your hand, deck, or Graveyard. This card cannot be tributed or used as material for the summon of a monster from the Extra Deck.

Tomb of the Necromancer
Field Spell
You cannot Special Summon from the Extra Deck. Once per turn, during your Standby Phase, if you control no monsters, you can Special Summon a Level 3 or lower "Necro" monster from your hand, deck, or Graveyard. At the start of your opponent's End Phase, you can target any number of "Necro" monsters in your Graveyard: place them face-up in your Spell/Trap Zones, but banish then at the end of the turn. Monsters placed in the Spell/Trap Zones by this card's effect are still treated as Monster Cards, but their effects are negated and they are unaffected by card effects, except "Tomb of the Necromancer".

Necro Balance
Continuous Spell
During the End Phase, the turn player must discard cards from the top of their deck to the Graveyard equal to the number of Monster Cards on the field. Monsters sent to the Graveyard by this effect, except "Necro" cards, cannot be targeted by card effects, cannot be banished, and their effects are negated and cannot be activated in the Graveyard.

Cursed Necrogift
Continuous Spell
If a card(s) is sent from your deck to the Graveyard, gain 200 Life Points for each card banished by this effect. If your opponent attacks a "Necro" monster on your side of the field, you can activate this effect: both players discard 1 card from the top of their deck.