Chimney Goyf — ruling 1

The ability that defines Chimney Goyf’s power and toughness works in all zones, not just the battlefield. If Chimney Goyf is in your graveyard, it will count itself.

Chimney Goyf — ruling 2

Chimney Goyf counts card types, not cards. If the only card in all graveyards is a single artifact creature, Chimney Goyf will be 2/3. If the only cards in all graveyards are ten artifact creatures, Chimney Goyf will still be 2/3.

Chimney Goyf — ruling 3

The card types that can normally 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.

Chimney Goyf — ruling 4

Some playtest cards have unusual type lines. To determine whether those cards have a card type not listed above, refer to that card’s Card-Specific Notes in this document.

Chimney Goyf — ruling 5

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

Chimney Goyf : règles, fonctionnement et interactions (MTG)

Chimney Goyf is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Flying Chimney Goyf'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. When Chimney Goyf dies, target opponent puts a card from their hand on top of their library.

How it works : Chimney Goyf

Original English text — Wizards of the Coast / Scryfall

#1November 12, 2019· Wizards of the Coast
The ability that defines Chimney Goyf’s power and toughness works in all zones, not just the battlefield. If Chimney Goyf is in your graveyard, it will count itself.
No other card is named in this ruling.
#2November 12, 2019· Wizards of the Coast
Chimney Goyf counts card types, not cards. If the only card in all graveyards is a single artifact creature, Chimney Goyf will be 2/3. If the only cards in all graveyards are ten artifact creatures, Chimney Goyf will still be 2/3.
No other card is named in this ruling.
#3November 12, 2019· Wizards of the Coast
The card types that can normally 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.
No other card is named in this ruling.
#4November 12, 2019· Wizards of the Coast
Some playtest cards have unusual type lines. To determine whether those cards have a card type not listed above, refer to that card’s Card-Specific Notes in this document.
No other card is named in this ruling.
#5November 12, 2019· Wizards of the Coast
If an instant or sorcery spell deals damage to Chimney Goyf or lowers its toughness, that spell is put into its owner’s graveyard before state-based actions are performed. If that spell is the first of its type to enter a graveyard, it will raise Chimney Goyf’s toughness before the game checks to see if Chimney Goyf dies.
No other card is named in this ruling.