Sea Of The Severing Void

{t}: Add {u/b} to your mana pool.
{t}: Whenever a creature card would be put into a graveyard from anywhere this turn, exile it
instead. When six or more creatures are exiled
this way, transform Sea of the Severing Void
Sea of the Severing Void can be your Commander.
Each time you play Sea of the Severing Void from
your command zone, pay an additional {2} for each
previous time you've played it from the command
zone this game.