Metamorphosis Fanatic, Phyrexian Altar, and Phantom Steed

Prerequisites

• Metamorphosis Fanatic in hand
• Phyrexian Altar on the battlefield
• Phantom Steed in the graveyard
• available

Steps

1. Cast Metamorphosis Fanatic by paying
2. When Metamorphosis Fanatic enters, it triggers, returning Phantom Steed from your graveyard to the battlefield
3. When Phantom Steed enters, it triggers, exiling Metamorphosis Fanatic until Phantom Steed leaves the battlefield
4. Activate Phyrexian Altar by sacrificing Phantom Steed
5. When Phantom Steed leaves the battlefield, Metamorphosis Fanatic is returned from exile to the battlefield
6. Repeat from step 2

Results

• Infinite LTB
• Infinite ETB
• Infinite colored mana
• Infinite sacrifice triggers
• Infinite death triggers