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.

• Phyrexian Unlife + Solemnity Bracket 3
  • 
  • 
  • You can't lose the game due to having 0 or less life
  • Lock Lock
    • Your opponents can't meaningfully play, so they're stuck until you win or they concede
  Steps on Commander Spellbook
• Delaying Shield + Solemnity Bracket 3
  • 
  • 
  • Prevent all damage that would be dealt to you
  • Lock Lock
    • Your opponents can't meaningfully play, so they're stuck until you win or they concede
  Steps on Commander Spellbook
• Delaying Shield + Phyrexian Unlife Bracket 3
  • 
  • 
  • You are unable to lose the game due to damage or lifeloss
  • 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.