Bachzim, Demon of Nightmares

Haste
When Bachzim, Demon of Nightmares comes
into play or attacks, discard a card at random.
Bachzim, Demon of Nightmares power and
toughness are each equal to the number of card
types among cards in your graveyard. If you have
five or more card types in your graveyard,
transform Bachzim, Demon of Nightmares.