Dredge Procession

Whenever one or more phyrexians you
control enter the battlefield, attack, or die,
Chamber 1. (Exile the bottom card of your
library to the sanctum. Any player can cast
spells and play lands in the sanctum.)
Whenever you would Chamber cards from
the bottom of your library, you may instead
move that many cards from the top of your
graveyard to the Chamber.