Lagrella, the Magpie, Sun Titan, and Ashnod's Altar

Prerequisites

• Lagrella, the Magpie in hand or in the command zone
• Sun Titan on the battlefield
• Ashnod's Altar on the battlefield
• plus enough mana to pay for commander tax, if applicable available

Steps

1. Cast Lagrella by paying and commander tax, if applicable
2. When Lagrella enters the battlefield, it triggers, exiling Sun Titan until Lagrella leaves the battlefield
3. Activate Ashnod's Altar by sacrificing Lagrella, adding
4. If Lagrella is your commander, choose not to return it to the command zone from your graveyard
5. When Lagrella leaves the battlefield, Sun Titan is returned to the battlefield from exile
6. When Sun Titan enters the battlefield, it and Lagrella triggers
7. Resolve the Lagrella trigger, putting two +1/+1 counters on Sun Titan
8. Resolve the Sun Titan trigger, returning Lagrella from your graveyard to the battlefield
9. Repeat from step 2

Results

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