Hexplate Wallbreaker

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

• WWizards of the Coast2023-02-04
  Official Ruling
  There's no main phase between your combat phases, so you'll have no opportunity to cast spells or activate abilities that could only be activated any time you could cast a sorcery. For example, you won't be able to cast another creature or activate Hexplate Wallbreaker's equip ability between combats.
• WWizards of the Coast2023-02-04
  Official Ruling
  If you attack with multiple creatures equipped with Hexplate Wallbreakers in one combat phase (or one creature equipped with multiple Hexplate Wallbreakers), you'll have that many additional combat phases, but your attacking creatures are untapped only during the current combat phase.
• WWizards of the Coast2023-02-04
  Official Ruling
  If the ability causes two Rebel tokens to be created (due to an effect such as that of Mondrak, Glory Dominus), the Equipment becomes attached to only one of them.
• WWizards of the Coast2023-02-04
  Official Ruling
  The Rebel enters the battlefield as a 2/2 creature, then the Equipment becomes attached to it. Abilities that trigger when a creature enters the battlefield see that a 2/2 creature entered the battlefield.
• WWizards of the Coast2023-02-04
  Official Ruling
  If the Rebel is destroyed, the Equipment stays on the battlefield. Similarly, you may pay its equip cost to move it from the Rebel token to another creature you control.
• WWizards of the Coast2023-02-04
  Official Ruling
  Once the equipped creature attacks and the triggered ability resolves, you get an additional combat phase even if the equipped creature doesn't survive the first combat phase.
• WWizards of the Coast2023-02-04
  Official Ruling
  Untapping an attacking creature doesn't remove it from combat.

Rulings via Scryfall