Sun Titan, Karmic Guide, Animate Dead, and Phyrexian Altar

Prerequisites

• Sun Titan in hand
• Karmic Guide in the graveyard
• Animate Dead in the graveyard
• Phyrexian Altar on the battlefield
• available

Steps

1. Cast Sun Titan
2. Sun Titan enters the battlefield, returning Animate Dead from your graveyard to the battlefield
3. With the Animate Dead trigger on the stack, Activate Phyrexian Altar, sacrificing Sun Titan to add a mana of any color
4. Resolve the Animate Dead trigger, causing it to become an Aura with "enchant creature put onto the battlefield with Animate Dead" and returning Karmic Guide from your graveyard to the battlefield
5. Animate Dead is put into your graveyard due to state based actions, as it cannot attach to a creature with protection from black
6. Animate Dead triggers, causing you to sacrifice Karmic Guide
7. Karmic Guide's enter the battlefield triggers
8. Resolve Karmic Guide's enter the battlefield trigger returning Sun Titan from your graveyard to the battlefield
9. Repeat from step 2

Results

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