You can activate Sheoldred’s last ability if any opponent has eight or more cards in their graveyard, not necessarily all of them.
2023-04-14
wotc
To resolve Sheoldred’s enters-the-battlefield ability in a multiplayer game, the next opponent in turn order (or, if it’s an opponent’s turn, the opponent whose turn it is) chooses a creature they control to sacrifice. Then each other opponent in turn order does the same. Then those creatures are sacrificed at the same time.
2023-04-14
wotc
To resolve chapter II of The True Scriptures in a multiplayer game, the next opponent in turn order (or, if it’s an opponent’s turn, the opponent whose turn it is) chooses three cards in hand. Any opponent who has fewer than three cards in hand chooses all cards they have in hand. They set the chosen cards aside without revealing them. Then each other opponent in turn order does the same. Next, all chosen cards are revealed and discarded at the same time. Then, each opponent mills three cards.
2023-04-14
wotc
Once you’ve activated Sheoldred’s last ability, it doesn’t matter what happens to the number of cards in opponents’ graveyards. The ability will resolve even if no opponent has eight or more cards in their graveyard by that time.
Format Legality
Standard
Not Legal
Future
Not Legal
Historic
Legal
Timeless
Legal
Gladiator
Legal
Pioneer
Legal
Modern
Legal
Legacy
Legal
Pauper
Not Legal
Vintage
Legal
Penny
Not Legal
Commander
Legal
Oathbreaker
Legal
Standardbrawl
Not Legal
Brawl
Legal
Alchemy
Not Legal
Paupercommander
Not Legal
Duel
Legal
Oldschool
Not Legal
Premodern
Not Legal
Predh
Not Legal
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