Ratadrabik of Urborg + Leyline of Singularity + Ravenous Rotbelly

Prerequisites

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Steps

1. 1Cast Ravenous Rotbelly by paying its mana cost.
2. 2When Ravenous Rotbelly enters, it triggers, causing you to sacrifice it and each opponent to sacrifice a creature.
3. 3When Ravenous Rotbelly dies, Ratadrabik triggers, creating a token copy of Ravenous Rotbelly that is a 2/2 legendary Zombie in addition to its other types.
4. 4Repeat from step 2 using the Ravenous Rotbelly token instead.

Effects

• Each opponent sacrifices all creatures they control
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers