Sword of the Meek

• WOTC Official Reminder Textofficial rules
  Equip — Equip [cost] ([cost]: Attach to target creature you control. Equip only as a sorcery.)

• WWizards of the Coast2020-08-07
  Official Ruling
  Sword of the Meek's last ability triggers only if it's in your graveyard immediately after the 1/1 creature enters the battlefield.
• WWizards of the Coast2020-08-07
  Official Ruling
  If a creature is entering the battlefield under your control, consider static abilities to determine whether its power and toughness are both 1. Spells, activated abilities, and triggered abilities can't be used to raise or lower the creature's power and toughness in time to have the last ability trigger or to stop it from triggering.
• WWizards of the Coast2020-08-07
  Official Ruling
  Any creature can be equipped with Sword of the Meek, not just 1/1 creatures.
• WWizards of the Coast2020-08-07
  Official Ruling
  Once the last ability has triggered, changing the power or toughness of the creature won't stop you from returning Sword of the Meek and attaching it to the creature.
• WWizards of the Coast2020-08-07
  Official Ruling
  If Sword of the Meek can't be attached to the creature that caused its last ability to trigger, most likely because that creature has left the battlefield, Sword of the Meek returns to the battlefield and remains unattached.

Rulings via Scryfall

• WO
  Wizards of the Coast2016-04-04

  Sword of the Meek was unbanned in modern on April 4, 2016. We looked at our banned lists for cards that could increase the richness of the format. Sword of the Meek makes a powerful, but slow, combination with Thopter Foundry. To allow for an increase in the number of controlling combo decks in the format, we are unbanning Sword of the Meek. Source: https://magic.wizards.com/en/news/news/banned-and-restricted-announcement-2016-04-04