Whenever a source you control deals damage to another player, put that many theft counters on Night Dealings.
, Remove X theft counters from Night Dealings: Search your library for a nonland card with converted mana cost X, reveal it, and put it into your hand. Then shuffle your library.

All creatures get -1/-1.

: Put target creature card from a graveyard onto the battlefield under your control.

: Nine-Ringed Bo deals 1 damage to target Spirit creature. If that creature would die this turn, exile it instead.

Equipped creature gets +2/+0 and has first strike.
Equip (: Attach to target creature you control. Equip only as a sorcery.)

Bushido 2 (Whenever this creature blocks or becomes blocked, it gets +2/+2 until end of turn.)
, Pay 5 life: Regenerate Numai Outcast.

Equipped creature gets +3/+1.
Whenever equipped creature dies, return that card to the battlefield under your control if it's a Samurai card.
When Oathkeeper, Takeno's Daisho is put into a graveyard from the battlefield, exile equipped creature.
Equip

: Add .
, : Target legendary creature gets +1/+1 until end of turn.

Enchant creature
At the beginning of your upkeep, sacrifice a creature.
Enchanted creature gets +3/+3 and has trample.
Enchanted creature is a Demon Spirit.

Reach (This creature can block creatures with flying.)
Whenever you cast a Spirit or Arcane spell, Orbweaver Kumo gains forestwalk until end of turn. (It can't be blocked as long as defending player controls a Forest.)

Whenever you cast a Spirit or Arcane spell, you may destroy target nonbasic land.

, : Create a 1/1 green Snake creature token. If you control ten or more creatures, flip Orochi Eggwatcher.

Orochi Hatchery enters the battlefield with X charge counters on it.
, : Create a 1/1 green Snake creature token for each charge counter on Orochi Hatchery.

: Add one mana of any color.

Whenever Orochi Ranger deals combat damage to a creature, tap that creature and it doesn't untap during its controller's next untap step.

: Add .

Exile target creature. At the beginning of the next end step, return that card to the battlefield under its owner's control with a +1/+1 counter on it.

, Sacrifice Pain Kami: It deals X damage to target creature.

Fear (This creature can't be blocked except by artifact creatures and/or black creatures.)
At the beginning of your upkeep, sacrifice a creature if you don't control an Ogre.