Murderous Redcap, and Celes, Rune Knight

Prerequisites

• Murderous Redcap in hand
• Celes, Rune Knight on the battlefield
• available

Steps

1. Cast Murderous Redcap by paying
2. When Murderous Redcap enters the battlefield, it triggers, dealing an amount of damage to itself equal to its power
3. Murderous Redcap dies as a state-based action due to having 0 toughness
4. Murderous Redcap's persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
5. When Murderous Redcap enters, it and Celes trigger
6. Resolve the Celes trigger, putting a +1/+1 counter on each creature you control
7. Resolve the Murderous Redcap trigger, dealing damage to itself equal to its power
8. Repeat from step 3

Results

• Infinite +1/+1 counters on most creatures you control
• Infinite ETB
• Infinite LTB
• Infinite death triggers