Dual Nature, Sylvan Hierophant, and Phyrexian Altar

Prerequisites

• Dual Nature on the battlefield
• Sylvan Hierophant in hand
• Phyrexian Altar on the battlefield
• available

Steps

1. Cast Sylvan Hierophant by paying
2. Dual Nature's first ability triggers, creating a token copy of Sylvan Hierophant
3. Sacrifice the nontoken Sylvan Hierophant to Phyrexian Altar, adding
4. Dual Nature's second ability triggers, and Sylvan Hierophant triggers targeting any other creature card in your graveyard
5. In response, sacrifice the token Sylvan Hierophant to Phyrexian Altar for
6. Dual Nature's second ability triggers, and the Sylvan Hierophant token triggers
7. Resolve the Sylvan Hierophant token's trigger, returning the nontoken Sylvan Hierophant to your hand
8. Resolve both Dual Nature abilities, exiling zero creauters
9. Resolve the nontoken Sylvan Hierophant's trigger, returning a creature card from your graveyard to your hand
10. Repeat

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers
• Infinite storm count
• Return all creatures from your graveyard to your hand