Phyrexian Waveleader

Trample
Voided (as you cast a spell with Voided, put a
card from your sideboard into the Void. As long
as you control a Phyrexian, you may cast cards
from the Void. At the end of the game, shuffle
all cards were in the Void into your deck. Your sideboard is reduced by one for each card
that was in the Void until the end of match.)
'It always starts as one...'