Just a few card ideas.

Night-Fire Kitsune - Level 3 - Dark/Pyro - 1500/0 - You cannot set this card. This card can only be played in face-up attack position, and cannot change battle position. This card cannot change battle position. When this card is normal summoned on your side of the field, you can special summon 1 "Night-Ocean Namazu" from your hand. You cannot use special summoned "Night-Ocean Namazu" as an XYZ material. If "Night-Ocean Namazu" is face up on your side of the field, this card can attack your opponent's life points directly.

Night-Ocean Namazu - Level 3 - Dark/Fish - 0/1500 - When this card is normal summoned or special summoned, it is played in face-up defence position. When this card is normal summoned on your side of the field, you can special summon 1 "Night-Fire Kitsune" from your hand. You cannot use the special summoned "Night-Fire Kitsune" as an XYZ material. Once during your opponent's turn, If a face up "Night-Fire Kitsune" on your side of the field would be destroyed, negate the activation or attack, and destroy that card.

Deathrock Dragon - Level 4 - Earth/Dragon - 1400/1600 - When this card is summoned, you can banish 1 rock-type monster from your side of the field. Your opponent cannot activate any spell/trap cards until their next end phase. You can only activate the effect of "Deathrock Dragon" once per duel.

Lights out - Quick play Spell - Flip 5 cards on either side of the field face-down. They return to their normal positions at the end phase.
Something Old, Something New - Trap - Return 1 banished card to your graveyard and discard 1 card.

Darkstrike - Spell - Once, when 1 DARK monster you control attacks an opponent's monster this turn, it can attack another monster.

Shotgun Sam - Level 4 - Earth/Warrior - 1600/600 - This card cannot be normal summoned or set. You must banish 2 EARTH monsters from your graveyard to special summon this card. This card can attack twice during your battle phase. This card cannot attack your opponent's life points directly. This card is unaffected by spell/trap effects.

Vampirococcus - Level 1 - Dark/Aqua - 0/0 - This card cannot be removed from the field, except by it's own effect. When this card is summoned, equip it to a monster. The equipped monster loses 200 attack points during each standby phase. When the equipped monster is at 0 ATK, it is destroyed. When the equipped monster is destroyed, special summon this card to it's owners side of the field. If there are no monsters on the field remove this card from play.

ST3 Destroyer - Revenant - Rank 6 - Water/Machine/XYZ - 2500/1500 - 2 level 6 machine-type monsters. Once per turn. You can detach 1 XYZ material from this card to destroy 1 spell/trap card on your opponent's side of the field. You can banish 1 machine-type monster from your hand, field or graveyard to attach 1 XYZ material monster that was detached using this effect.

I may post some of these for the set. But i'd prefer for things to be perfected before submitting.

Nazamu + Kitsune look incredibly dull and not especially useful.

Deathrock Dragon is a monster Cold Wave that doesn't affect yourself.

Lights Out will apparently need 5 face-up targets to be of use, which is quite situational. Still, may have some odd Nox build that can use.

Something Old, Something New is outclassed by too many cards.

Darkstrike, does it let it attack again? Not sure based off wording. Still, seems bad and should probably be a Quick-Play.

Shotgun Sam seems OK.

Vampirococcus is a type of card I've seen plenty of times before. It's a thoroughly bad concept, as it will rarely drop a monsters ATK effectively enough to have it destroyed in any fashion.

ST3 Destroyer - Revenant is a good card but with almost no effective way to Summon it.