Solemnity + Carrion Feeder + Creature with Persist or Undying

Prerequisites

• If a persist creature is used, it does not have a -1/-1 counter on it. Otherwise, if an undying creature is used, it does not have a +1/+1 counter on it.
• Creature with Persist or Undying

Steps

1. 1Activate Carrion Feeder by sacrificing the persist or undying creature.
2. 2When the creature dies, its persist or undying ability triggers, returning it from your graveyard to the battlefield without a -1/-1 counter or a +1/+1 counter on it due to Solemnity.
3. 3Resolve the Carrion Feeder ability.
4. 4Repeat.

Effects

• Infinite +1/+1 counters on a creature
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers