Kaya's Ghostform, Phyrexian Altar, and Sun Titan

Prerequisites

• Kaya's Ghostform on the battlefield
• Phyrexian Altar on the battlefield
• Sun Titan on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing Sun Titan
2. When Sun Titan dies, Kaya's Ghostform triggers, returning Sun Titan from your graveyard to the battlefield
3. When Sun Titan enters, it triggers, returning Kaya's Ghostform from your graveyard to the battlefield attached to Sun Titan Repeat

Results

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