Putrid Goblin, Cathars' Crusade, and Mogg Raider

Prerequisites

• Putrid Goblin on the battlefield
• Cathars' Crusade on the battlefield
• Mogg Raider on the battlefield

Steps

1. Activate Mogg Raider by sacrificing Putrid Goblin When Putrid Goblin dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
2. When Putrid Goblin enters, Cathars' Crusade triggers, putting a +1/+1 counter on each creature you control Resolve the Mogg Raider ability
3. Repeat

Results

• Infinite +1/+1 counters on most creatures you control
• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite sacrifice triggers
• Infinitely large creatures you control until end of turn