Golgari Grave-Troll

• WWizards of the Coast2018-12-07
  Official Ruling
  Because damage remains marked on a creature until it's removed as the turn ends, nonlethal damage dealt to Golgari Grave-Troll may become lethal if you remove +1/+1 counters from it during that turn. In this case, it dies before you can resolve the activated ability that will regenerate it.
• WWizards of the Coast2018-12-07
  Official Ruling
  If you return Golgari Grave-Troll from your graveyard directly to the battlefield, its first ability counts itself.
• WWizards of the Coast2024-01-12
  Official Ruling
  If an effect puts a card into your hand without specifically using the word "draw," you're not drawing a card. Dredge can't replace this event.
• WWizards of the Coast2024-01-12
  Official Ruling
  Once you've announced that you're applying a card's dredge ability to replace a draw, players can't take any actions until you've put that card into your hand and milled cards.
• WWizards of the Coast2024-01-12
  Official Ruling
  Dredge can replace any card draw, not only the one during your draw step.
• WWizards of the Coast2024-01-12
  Official Ruling
  If you're drawing multiple cards, each draw is performed one at a time. For example, if you're instructed to draw two cards and you replace the first draw with a dredge ability, another card with a dredge ability (including one that was milled by the first dredge ability) may be used to replace the second draw.
• WWizards of the Coast2024-01-12
  Official Ruling
  You can't attempt to use a dredge ability if you don't have enough cards in your library.
• WWizards of the Coast2024-01-12
  Official Ruling
  One card draw can't be replaced by multiple dredge abilities.

Rulings via Scryfall

• WO
  Wizards of the Coast2015-02-03

  Golgari Grave-Troll was unbanned in modern on February 3, 2015. With a new toy unbanned as well, players on the Pro Tour have plenty to play with as they prepare for every possibility. Source: https://magic.wizards.com/en/news/arcana/brief-history-modern-banned-list-2015-02-03
• WO
  Wizards of the Coast2015-02-03

  Golgari Grave-Troll was banned in modern on February 3, 2015. Modern kicked off with a banned list that was created in large part based on Legacy play, the old Extended format, and decks played at the Community Cup that year. We are going to allow turn-four combination decks, but not decks that consistently win the game on turn three. Source: https://magic.wizards.com/en/news/arcana/brief-history-modern-banned-list-2015-02-03
• WO
  Wizards of the Coast2019-08-26

  Golgari Grave-Troll was restricted in vintage on August 26, 2019. Dredge decks based around Bazaar of Baghdad have become more powerful with the London mulligan and some recent card additions. In order to slow these decks down and provide more time for interaction, we are restricting Golgari Grave-Troll. Source: https://magic.wizards.com/en/news/news/august-26-2019-banned-and-restricted-announcement-2019-08-26
• WO
  Wizards of the Coast2015-01-19

  Golgari Grave-Troll was unbanned in modern on January 19, 2015. Golgari Grave-Troll is very powerful in a deck based on getting a lot of cards into its graveyard. However, that type of deck has not been as successful in Modern tournaments recently. While taking such a card off the banned list has some risks, this is a good time to see what happens. Source: https://magic.wizards.com/en/news/feature/banned-and-restricted-announcement-2015-01-19