Zameck Guildmage, and Yahenni, Undying Partisan

Prerequisites

• Zameck Guildmage on the battlefield
• Yahenni, Undying Partisan on the battlefield
• available

Steps

1. Activate Zameck Guildmage's first ability by paying
2. Activate Yahenni by sacrificing the persist creature
3. When the persist creature dies, its persist ability triggers, returning it from your graveyard to the battlefield without a -1/-1 counter on it due to Zameck Guildmage
4. Resolve the Yahenni ability
5. Repeat from step 2

Results

• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite sacrifice triggers