Murderous Redcap, and Railway Brawler

Prerequisites

• Murderous Redcap in hand
• Railway Brawler on the battlefield
• available

Steps

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

Results

• Infinite LTB
• Infinite ETB
• Infinite death triggers