Agrahel, Regression Engineer

Slivers you don't control are Beasts and lose all other types. Slivers gain "{t}: Add {c}. Use this
only to cast a Sliver spell or activate an ability
of a Sliver."
{3}: Each player creates a 1/1 colorless Sliver creature token.

Slivers were once beasts of burden. They can be again.