None keeps a deck in Bracket 1 or 2. One to three make it Bracket 3, and four or more make it Bracket 4.

A combo raises the deck to its own bracket. A fast two-card infinite is Bracket 4.

• Magistrate's Scepter + Moxite Refinery Bracket 4
  • 
  • 
  • ∞Infiniteturns
  • Lock Lock
    • Your opponents can't meaningfully play, so they're stuck until you win or they concede
  Steps on Commander Spellbook
• Aetheric Amplifier + Magistrate's Scepter Bracket 4
  • 
  • 
  • ∞Infiniteturns
  • Lock Lock
    • Your opponents can't meaningfully play, so they're stuck until you win or they concede
  Steps on Commander Spellbook
• Ioreth of the Healing House + Marvin, Murderous Mimic Bracket 3
  • 
  • 
  • ∞Infiniteuntap of legendary creatures you control
  • ∞Infinitemana legendary creatures you control can produce
  Steps on Commander Spellbook
• Arcbound Ravager + Emry, Lurker of the Loch + The One Ring Bracket 3
  • 
  • 
  • 
  • Prevent all damage that would be dealt to you
  • You have protection from everything
  • Lock Lock
    • Your opponents can't meaningfully play, so they're stuck until you win or they concede
  Steps on Commander Spellbook

Any rules out Bracket 1. Brackets 2 and 3 allow a few, never chained or looped; Icarian counts three or more as Bracket 3.

Any at all makes it Bracket 4. Brackets 1 to 3 don't allow it.