Zubera

Zubera is creature type unique to the Kamigawa block. A Zubera is the faceless kami of a human who has been pulled into the spirit world. Zubera are said to attack solitary travelers in order to steal their faces. In fact, Zubera is essentially a species of Spirits. No Zubera is printed without the Spirit type.

Kamigawa
The type first surfaced as a cycle in the set Champions of Kamigawa. Each of these common 1/2 creatures costs M and has a triggered ability when it goes to the graveyard that grows with each Zubera put into a graveyard from play that turn. There's one for each color:
 * Silent-Chant Zubera
 * Floating-Dream Zubera
 * Ashen-Skin Zubera
 * Ember-Fist Zubera
 * Dripping-Tongue Zubera

Saviors of Kamigawa added two mirrored 3/3 uncommon creatures for MM with an ability that triggers if they go to the graveyard from play after being dealt four damage or more that turn.
 * Burning-Eye Zubera
 * Rushing-Tide Zubera

Trivia

 * Zubera is a corruption of Noppera-bō, the term for the Japanese yokai that inspired these creatures.
 * The creative team made Zubera an additional creature type (alongside Spirit) so that they could key off of type when they died.
 * A giant Dripping-Tongue Zubera is depicted in Unchecked Growth.
 * The names of the Zubera don't link directly to the Shrines (like the Myojin do), but the connection still comes through with their abilities.
 * The Zubera were made as a Kindle variant that went on creatures and only counted other Zubera that died the same turn as it did.