Ratadrabik of Urborg, Leyline of Singularity, and Mercurial Pretender

Prerequisites

• Ratadrabik of Urborg on the battlefield
• Leyline of Singularity on the battlefield
• Mercurial Pretender in hand
• available

Steps

1. Cast Mercurial Pretender by paying its mana cost
2. Choose to have it enter as a copy of Ratadrabik
3. Put Mercurial Pretender into your graveyard due to the legend rule
4. When Mercurial Pretender dies, Ratadrabik triggers, creating a token copy of Mercurial Pretender that is a copy of Ratadrabik but is a 2/2 Zombie in addition to its other types
5. Repeat from step 2 using the Mercurial Pretender token instead

Results

• Draw the game
• Infinite ETB
• Infinite LTB
• Infinite death triggers