Graveyard Busybody — ruling 1

Only you can use abilities of cards in graveyards. For example, if a spell requires that you exile cards from your graveyard, you can exile cards from any graveyard. Any card that looks at cards in graveyards looks at any or all your graveyards.

Graveyard Busybody — ruling 2

Cards owned by your opponents still go to the appropriate graveyard.

Graveyard Busybody — ruling 3

If an effect asks how many cards are in your graveyard, use the total number of cards in all your graveyards. However, they are still separate graveyards. If an effect affects a single graveyard, such as shuffling it into its owner’s library, only that one graveyard is shuffled in.

Graveyard Busybody — ruling 4

Speaking of that, cards in graveyards are shuffled into their owners’ libraries. You won’t put any cards from graveyards you stole, er . . . borrowed into your library.

Graveyard Busybody — ruling 5

If more than one player controls a Graveyard Busybody, the one that entered the battlefield most recently “wins.” The controller of that Graveyard Busybody has all the graveyards, and any other player’s Graveyard Busybody is a 0/0 that is put into the graveyard that player used to have as a state-based action.

Graveyard Busybody : règles, fonctionnement et interactions (MTG)

Graveyard Busybody 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

All graveyards are also your graveyards. Graveyard Busybody's power and toughness are each equal to the number of cards with flavor text in your graveyards.

How it works : Graveyard Busybody

Original English text — Wizards of the Coast / Scryfall

#1January 19, 2018· Wizards of the Coast
Only you can use abilities of cards in graveyards. For example, if a spell requires that you exile cards from your graveyard, you can exile cards from any graveyard. Any card that looks at cards in graveyards looks at any or all your graveyards.
No other card is named in this ruling.
#2January 19, 2018· Wizards of the Coast
Cards owned by your opponents still go to the appropriate graveyard.
No other card is named in this ruling.
#3January 19, 2018· Wizards of the Coast
If an effect asks how many cards are in your graveyard, use the total number of cards in all your graveyards. However, they are still separate graveyards. If an effect affects a single graveyard, such as shuffling it into its owner’s library, only that one graveyard is shuffled in.
No other card is named in this ruling.
#4January 19, 2018· Wizards of the Coast
Speaking of that, cards in graveyards are shuffled into their owners’ libraries. You won’t put any cards from graveyards you stole, er . . . borrowed into your library.
No other card is named in this ruling.
#5January 19, 2018· Wizards of the Coast
If more than one player controls a Graveyard Busybody, the one that entered the battlefield most recently “wins.” The controller of that Graveyard Busybody has all the graveyards, and any other player’s Graveyard Busybody is a 0/0 that is put into the graveyard that player used to have as a state-based action.
No other card is named in this ruling.