Eulogea, Mourner of the Core

Eulogea, Mourner of the Core's power and
toughness are each equal to the number of
artifacts you control.
Whenever another artifact enters the battlefield
under your control, you may pay {1}. If you do,
each opponent loses a life. If you control 5 or
more artifacts, you gain that much life.

She hymns not for the loss of life, but for the loss of
another recruit.