Necromancer's Magemark, Spiteful Hexmage, and Phyrexian Altar

Prerequisites

• Necromancer's Magemark on the battlefield
• Spiteful Hexmage in hand
• Phyrexian Altar on the battlefield
• available

Steps

1. Cast Spiteful Hexmage by paying
2. When Spiteful Hexmage enters the battlefield, it triggers, creating a Cursed Role token attached to it
3. Activate Phyrexian Altar by sacrificing Spiteful Hexmage, adding
4. Spiteful Hexmage is returned to your hand instead of being put into your graveyard due to Necromancer's Magemark
5. Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers
• Infinite storm count