"Modern Masters 2017 Edition", +m/cards\sin\s.*graveyard/, +!delirium, +!"spell mastery", +!threshold (3)
Creature cards in graveyards and libraries can't enter the battlefield.
Players can't cast spells from graveyards or libraries.
When Pit Keeper enters, if you have four or more creature cards in your graveyard, you may return target creature card from your graveyard to your hand.
Tarmogoyf's power is equal to the number of card types among cards in all graveyards and its toughness is equal to that number plus 1.
Gatherer works better in the Companion app!