Hm

Darkest Hour wrote:Poison Flask of Stygian Rot
Spell/Equip
When the equipped monster deals battle damage to the opponent: inflict 800 damage to your opponent's Life Points, and an additional 500 damage to the opponent during each of their Standby Phases.
Cool continuous burn, does the additional stack?

Poison Flask of Sullenbane
Spell/Equip
When the equipped monster deals battle damage to the opponent: inflict 500 damage to your opponent, and an additional 200 damage to the opponent for each card in their hand.
same

Ether of Soul Corrosion
Spell/Equip
When the equipped monster is sent to the Graveyard: Special Summon 1 Level 1 Monster from your Graveyard, and destroy 1 card on the field.
Lurv it.

Stillness of Eternity
Spell/Continuous
If you have exactly 0 cards in your Graveyard, the ATK and DEF of all monsters you control is increased by 1000.
Nice but hard to use, consider something like "3 or less cards"?

Calamity of the Necropolis
Trap/Continuous
Increase the ATK and DEF of all face-up monsters you control by 200 for each card in your Graveyard.
Useful
Gravity Razor
Spell/Equip
When the equipped monster attacks an opponent's monster, during the damage step increase the ATK of your monster by 300 for each Level star the opponent's monster has until the End Phase.
Quite like this one, you can take down almost anything

Gauntlet of the Wight
Spell/Equip
Increase the ATK of the equipped monster by 800. The equipped monster can attack twice during the turn the opponent activates a Quick-Play Spell Card. The equipped monster cannot be destroyed in battle the turn the opponent activates a Normal Spell Card.
ATK and bonus effects are nice.