How can you create a combo with Lagrella, the Magpie, Sun Titan, Phyrexian Altar?
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[START OF COMBO]This combo can be formed with Lagrella, the Magpie, Sun Titan, Phyrexian Altar

Color identity: GWU
Mana cost: {G}{W}{U} plus enough mana to pay for commander tax, if applicable
Steps:
  1. Cast Lagrella by paying {G}{W}{U} and commander tax, if applicable.
  2. When Lagrella enters the battlefield, it triggers, exiling Sun Titan until Lagrella leaves the battlefield.
  3. Activate Phyrexian Altar by sacrificing Lagrella, adding one mana of any color.
  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.[END OF COMBO STEPS]

Result:
  - Infinite colored mana
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite sacrifice triggers[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Lagrella, the Magpie must be in your hand or in the command zone
  - Sun Titan must be on the battlefield
  - Phyrexian Altar must be on the battlefield
[END OF COMBO PREREQUISITES]
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