Blade of Selves

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

• WWizards of the Coast2015-11-04
  Official Ruling
  Each token copies exactly what was printed on the original creature and nothing else. It doesn't copy whether that creature is tapped or untapped, whether it has any counters on it or Auras and Equipment attached to it, or any non-copy effects that have changed its power, toughness, types, color, and so on.
• WWizards of the Coast2015-11-04
  Official Ruling
  If the defending player is your only opponent, no tokens are put onto the battlefield.
• WWizards of the Coast2015-11-04
  Official Ruling
  If myriad creates more than one token for any given player (due to an effect such as the one Doubling Season creates), you may choose separately for each token whether it's attacking the player or a planeswalker they control.
• WWizards of the Coast2015-11-04
  Official Ruling
  If the equipped creature is legendary, the tokens will all enter the battlefield. Then you'll choose one of them to remain on the battlefield. The others will be put into your graveyard. Any enters-the-battlefield or dies triggers of the tokens will work.
• WWizards of the Coast2015-11-04
  Official Ruling
  The term “defending player” in the myriad rules (or any other ability of an attacking creature) refers to the player the creature with myriad was attacking at the time it became an attacking creature this combat, or the controller of the planeswalker the creature was attacking at the time it became an attacking creature this combat.
• WWizards of the Coast2015-11-04
  Official Ruling
  The token creatures all enter the battlefield at the same time.
• WWizards of the Coast2015-11-04
  Official Ruling
  Although the tokens enter the battlefield attacking, they were never declared as attackers. Abilities that trigger whenever a creature attacks won't trigger, including the myriad ability of the tokens. If there any costs to have a creature attack, those costs won't apply to the tokens.
• WWizards of the Coast2015-11-04
  Official Ruling
  Any enters-the-battlefield abilities of the copied creature will trigger when the token enters the battlefield. Any “as [this permanent] enters the battlefield” or “[this permanent] enters the battlefield with” abilities of the copied creature will also work.
• WWizards of the Coast2015-11-04
  Official Ruling
  If a creature has multiple instances of myriad, each triggers separately. You'll get two tokens per opponent other than the defending player.
• WWizards of the Coast2015-11-04
  Official Ruling
  You choose whether each token is attacking the player or a planeswalker they control as the token is created.
• WWizards of the Coast2015-11-04
  Official Ruling
  If the tokens aren't creatures (perhaps because the equipped creature was an animated land), they'll enter the battlefield but they won't be attacking. You'll still exile those tokens at end of combat.

Rulings via Scryfall