Cathars' Crusade + Goblin Chirurgeon + Putrid Goblin

RWB identity

Commander legal

The 3 combo pieces

• Cathars' Crusade
• Goblin Chirurgeon
• Putrid Goblin

How to execute it

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

What the combo produces

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