Drievr, Ending Sentinel

Vanishing 3, Extort, Afterlife 3
When this spell is cast, if {u} was used, create a
1/1 spirit token for each artifact you control. if {b} was used, this creature gains, "when a counter
is removed from a permanent, create {e}."
{t}{u/b}{w/b}: create a legendary artifact construct with
power and toughness equal to the number of
artifacts you control.
Pay X life {e}{c}: surveil X, then cast an artifact
from you graveyard for converted cost X or less.