Mikaeus, the Unhallowed + Putrid Goblin + Yahenni, Undying Partisan

Prerequisites

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Steps

1. 1Activate Yahenni by sacrificing Putrid Goblin.
2. 2When Putrid Goblin dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
3. 3Resolve the Yahenni ability.
4. 4Activate Yahenni by sacrificing Putrid Goblin.
5. 5When Putrid Goblin dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
6. 6Resolve the Yahenni ability.
7. 7Repeat.

Effects

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