Knigmog, Unleashed from Rycean

When Knigmog, Unleashed from Rycean dies,
shuffle a unique event named Collector of
Souls I in your library that puts a 2/2 black
Demon legendary creature token named
Knigmog, Whispering Murmur with menace
and can shuffle Collector of Souls II. (There can
only be one Unique Event with the same name in a
library. Whenever an event is put into a player's hand
it is casted and exiled, then that player draws a card.)