Shoggoth, Sentient Blob

Shoggoth, Sentient Blob 's power is equal to the
number of card types among cards in your
graveyard and its toughness is equal to that
number plus 1.
At the beginning of your end step, create a green
Ooze creature token with "This creature's power
is equal to the number of card types among cards
in your graveyard and its toughness is equal to
that number plus 1."