Irisviel, The White Grail

Eminence - As long as Irisviel, The White Grail is in
the command zone or on the battlefield, other
Servant spells you cast cost {w} less to cast and the
abilities of Servants you control cost {w} less to
activate.
Lifelink, Ward {w}
Song of Grail - Whenever another creature you
control dies, return it to the battlefield tapped at the
beginning of the next end step.