Metamorphosis Fanatic, Phyrexian Altar, and Icewind Stalwart

Prerequisites

• Metamorphosis Fanatic on the battlefield
• Phyrexian Altar on the battlefield
• Icewind Stalwart in hand

Steps

1. Cast Icewind Stalwart by paying its mana cost
2. When Icewind Stalwart enters the battlefield, it triggers, targeting Metamorphosis Fanatic
3. Holding priority, activate Phyrexian Altar by sacrificing Icewind Stalwart
4. Resolve the Icewind Stalwart ability, blinking Metamorphosis Fanatic
5. When Metamorphosis Fanatic enters the battlefield, it triggers, returning Icewind Stalwart from your graveyard to the battlefield
6. Repeat from step 2

Results

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