Geralf, the Fleshwright, Putrid Goblin, and Yahenni, Undying Partisan

Prerequisites

• Geralf, the Fleshwright on the battlefield
• Putrid Goblin on the battlefield
• Yahenni, Undying Partisan on the battlefield
• Putrid Goblin does not have a -1/-1 counter on it
• You have had at least one Zombie enter the battlefield under your control this turn

Steps

1. Activate Yahenni 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 the battlefield, Geralf's second ability triggers, putting a number of +1/+1 counters on it equal to the number of other Zombies that entered the battlefield under your cotnrol this turn
4. Resolve the Yahenni ability, giving it indestructible until end of turn
5. Repeat

Results

• Infinite +1/+1 counters on Putrid Goblin
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers