Sun Titan, Ashnod's Altar, and Gift of Immortality

Prerequisites

• Sun Titan on the battlefield
• Ashnod's Altar on the battlefield
• Gift of Immortality on the battlefield

Steps

1. Activate Ashnod's Altar by sacrificing Sun Titan
2. When Sun Titan dies, Gift of Immortality triggers, returning Sun Titan from your graveyard to the battlefield
3. When Sun Titan enters, it triggers, returning Gift of Immortality from your graveyard to the battlefield attached to Sun Titan
4. Repeat

Results

• Infinite colorless mana
• Infinite death triggers
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers