Rival, Manifested Mannequin

Rival, Manifested Mannequins power is equal to
the number of artifacts you control.
Whenever Rival, Manifested Mannequin enters
the battlefield you may pay {b}{b}. If you do each opponent sacrifices a creature or planeswalker.
When Rival, Manifested Mannequin dies, you
may pay {3}{u}. If you do create a token of Rival, Manifested Mannequin on the battlefield.