Cancer, The Crab

Deathtouch, shulk
{x}{u}{g}{b}, {t}, Sacrifice Cancer, The Crab:
Exile up to X cards from your graveyard, then
each player shuffles their hand and graveyard
into their library, then draws seven cards. Put all
cards exiled this way into your graveyard. Any
player may pay {x}{x} to counter this ability,
where X is equal the amount you paid X
originally in the cost.