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.

• Chrome Dome + Powerstone Shard Bracket 3
  • 
  • 
  • ∞Infiniteartifact ETB Infinite artifact ETB
    • ETB: enters the battlefield
  • ∞Infiniteartifact LTB Infinite artifact LTB
    • LTB: leaves the battlefield
  • ∞Infiniteartifact sacrifice triggers
  • ∞Infinitecreature ETB Infinite creature ETB
    • ETB: enters the battlefield
  • ∞Infinitecreature LTB Infinite creature LTB
    • LTB: leaves the battlefield
  • ∞Infinitecolorless mana
  • ∞Infinitecopies of artifacts you control with haste
  • ∞Infinitecreature tokens with haste
  • ∞Infinitedeath triggers
  • ∞Infinitecreature sacrifice triggers
  Steps on Commander Spellbook
• Clock of Omens + Krobus + Transmutation Font Bracket 1
  • 
  • 
  • 
  • ∞Infiniteartifact ETB Infinite artifact ETB
    • ETB: enters the battlefield
  • ∞Infiniteartifact LTB Infinite artifact LTB
    • LTB: leaves the battlefield
  • ∞Infiniteartifact sacrifice triggers
  • ∞Infiniteartifact tokens
  • ∞InfiniteBlood tokens
  • ∞Infinitecard draw
  • ∞InfiniteClue tokens
  • ∞Infinitecolored mana
  • ∞Infinitedraw triggers
  • ∞InfiniteFood tokens
  • ∞Infinitelifegain
  • ∞Infinitelifegain triggers
  • ∞Infinitemana artifacts you control can produce
  • ∞Infiniterummaging
  • ∞Infiniteself-discard triggers
  • ∞InfiniteTreasure tokens
  • ∞Infiniteuntap of artifacts you control
  Steps on Commander Spellbook
• Clock of Omens + Grinding Station + Transmutation Font Bracket 1
  • 
  • 
  • 
  • ∞Infinitetapped Food tokens
  • ∞Infinitetapped Clue tokens
  • ∞Infinitetapped Blood tokens
  Steps on Commander Spellbook
• Grinding Station + Junk Diver + Mycosynth Golem + Myr Retriever Bracket 1
  • 
  • 
  • 
  • 
  • ∞Infinitedeath triggers
  • ∞Infinitecreature ETB Infinite creature ETB
    • ETB: enters the battlefield
  • ∞Infinitecreature LTB Infinite creature LTB
    • LTB: leaves the battlefield
  • ∞Infinitemill
  • ∞Infinitecreature sacrifice triggers
  • ∞Infiniteself-mill
  • ∞Infinitestorm count
  Steps on Commander Spellbook
• Grinding Station + Mycosynth Golem + Myr Retriever + Workshop Assistant Bracket 1
  • 
  • 
  • 
  • 
  • ∞Infinitedeath triggers
  • ∞Infinitecreature ETB Infinite creature ETB
    • ETB: enters the battlefield
  • ∞Infinitecreature LTB Infinite creature LTB
    • LTB: leaves the battlefield
  • ∞Infinitemill
  • ∞Infinitecreature sacrifice triggers
  • ∞Infiniteself-mill
  • ∞Infinitestorm count
  Steps on Commander Spellbook
• Battered Golem + Clock of Omens + Transmutation Font Bracket 1
  • 
  • 
  • 
  • ∞Infinitetapped Food tokens
  • ∞Infinitetapped Clue tokens
  • ∞Infinitetapped Blood tokens
  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.