Skirk Prospector, Scuzzback Marauders, and Cathars' Crusade

Prerequisites

• Skirk Prospector on the battlefield
• Scuzzback Marauders on the battlefield
• Cathars' Crusade on the battlefield
• Scuzzback Marauders does not have a -1/-1 counter on it

Steps

1. Activate Skirk Prospector by sacrificing Scuzzback Marauders, adding
2. When Scuzzback Marauders dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
3. When Scuzzback Marauders enters the battlefield, Cathars' Crusade triggers, putting a +1/+1 counter on each creature you control
4. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite red mana
• Infinite +1/+1 counters