2021-03-19 : If an instant or sorcery spell deals damage to Tarmogoyf or lowers its toughness, that spell is put into its owner’s graveyard before state-based actions are performed. If that card is the first of its type to enter a graveyard, it will raise Tarmogoyf’s toughness before the game checks to see if Tarmogoyf dies.

2021-03-19 : Tarmogoyf counts card types, not cards. If the only card in all graveyards is a single artifact creature, Tarmogoyf will be 2/3. If the only cards in all graveyards are ten artifact creatures, Tarmogoyf will still be 2/3.

2021-03-19 : The ability that defines Tarmogoyf’s power and toughness works in all zones, not just the battlefield. If Tarmogoyf is in your graveyard, it will count itself.

2021-03-19 : The card types that can appear on cards in a graveyard are artifact, creature, enchantment, instant, land, planeswalker, sorcery, and tribal. Legendary, basic, and snow are supertypes, not card types.