Incarnation
Incarnation literally means embodied in flesh or taking on flesh. It refers to the conception and birth of a sentient creature which is the material manifestation of a force or concept whose original nature is immaterial.
The creature type first appeared in Judgement Each of these uncommon creatures had a common keyword ability, and gives creatures you control that ability as long as the it is in your graveyard and you control a land of the appropriate type: Valor, Wonder, Filth, Anger, and Brawn. Genesis and Glory are incarnations with similar abilities, but are not part of the cycle.
Inspired by the original cycle, Lorwyn had a cycle of rare Elemental Incarnations costing CCC. Each grants a powerful boon to its controller, and is shuffled back into its owner's library if put into its owner's graveyard from anywhere — Purity, Guile, Dread, Hostility, and Vigor.
Personal Incarnation from Alpha gained the subtype Incarnation retroactively.